revert: restore full config overwrite + Common Config Snippet (revert 992dda5c)

Revert the partial key-field merging refactoring introduced in 992dda5c,
along with two dependent commits (24fa8a18, 87604b18) that referenced
the now-removed ClaudeQuickToggles component.

The whitelist-based partial merge approach had critical issues:
- Non-whitelisted custom fields were lost during provider switching
- Backfill permanently stripped non-key fields from the database
- Whitelist required constant maintenance to track upstream changes

This restores the proven "full config overwrite + Common Config Snippet"
architecture where each provider stores its complete configuration and
shared settings are managed via a separate snippet mechanism.

Reverted commits:
- 24fa8a18: context-aware JSON editor hint + hide quick toggles
- 87604b18: hide ClaudeQuickToggles when creating
- 992dda5c: partial key-field merging refactoring

Restored:
- Full config snapshot write (write_live_snapshot) for Claude/Codex/Gemini
- Full config backfill (settings_config = live_config)
- Common Config Snippet UI and backend commands
- 6 frontend components/hooks for common config editing
- configApi barrel export and DB snippet methods

Removed:
- ClaudeQuickToggles component
- write_live_partial / backfill_key_fields / patch_claude_live
- All KEY_FIELDS constants

src/i18n/locales/en.json

@@ -51,8 +51,15 @@
   },
   "claudeConfig": {
     "configLabel": "Claude Code settings.json (JSON) *",
+    "writeCommonConfig": "Write Common Config",
+    "editCommonConfig": "Edit Common Config",
+    "editCommonConfigTitle": "Edit Common Config Snippet",
+    "commonConfigHint": "This snippet will be merged into settings.json when 'Write Common Config' is checked",
     "fullSettingsHint": "Full Claude Code settings.json content",
-    "fragmentSettingsHint": "Config snippet for this provider; will be written to settings.json when activated",
+    "extractFromCurrent": "Extract from Editor",
+    "extractNoCommonConfig": "No common config available to extract from editor",
+    "extractFailed": "Extract failed: {{error}}",
+    "saveFailed": "Save failed: {{error}}",
     "hideAttribution": "Hide AI Attribution",
     "alwaysThinking": "Extended Thinking",
     "enableTeammates": "Teammates Mode"
@@ -118,7 +125,11 @@
     "notes": "Notes",
     "notesPlaceholder": "e.g., Company dedicated account",
     "configJson": "Config JSON",
+    "writeCommonConfig": "Write common config",
+    "editCommonConfigButton": "Edit common config",
     "configJsonHint": "Please fill in complete Claude Code configuration",
+    "editCommonConfigTitle": "Edit common config snippet",
+    "editCommonConfigHint": "Common config snippet will be merged into all providers that enable it",
     "addProvider": "Add Provider",
     "sortUpdated": "Sort order updated",
     "usageSaved": "Usage query configuration saved",
@@ -669,10 +680,6 @@
     "apiFormatHint": "Select the input format for the provider's API",
     "apiFormatAnthropic": "Anthropic Messages (Native)",
     "apiFormatOpenAIChat": "OpenAI Chat Completions (Requires proxy)",
-    "authField": "Auth Field",
-    "authFieldAuthToken": "Auth Token (Default)",
-    "authFieldApiKey": "API Key",
-    "authFieldHint": "Most third-party providers use Auth Token; a few require API Key",
     "anthropicDefaultHaikuModel": "Default Haiku Model",
     "anthropicDefaultSonnetModel": "Default Sonnet Model",
     "anthropicDefaultOpusModel": "Default Opus Model",
@@ -744,15 +751,33 @@
     "authJsonHint": "Codex auth.json configuration content",
     "configToml": "config.toml (TOML)",
     "configTomlHint": "Codex config.toml configuration content",
-    "apiUrlLabel": "API Request URL"
+    "writeCommonConfig": "Write Common Config",
+    "editCommonConfig": "Edit Common Config",
+    "editCommonConfigTitle": "Edit Codex Common Config Snippet",
+    "commonConfigHint": "This snippet will be appended to the end of config.toml when 'Write Common Config' is checked",
+    "apiUrlLabel": "API Request URL",
+    "extractFromCurrent": "Extract from Editor",
+    "extractNoCommonConfig": "No common config available to extract from editor",
+    "extractFailed": "Extract failed: {{error}}",
+    "saveFailed": "Save failed: {{error}}"
   },
   "geminiConfig": {
     "envFile": "Environment Variables (.env)",
     "envFileHint": "Configure Gemini environment variables in .env format",
     "configJson": "Configuration File (config.json)",
     "configJsonHint": "Configure Gemini extended parameters in JSON format (optional)",
+    "writeCommonConfig": "Write Common Config",
+    "editCommonConfig": "Edit Common Config",
+    "editCommonConfigTitle": "Edit Gemini Common Config Snippet",
+    "commonConfigHint": "This snippet writes to Gemini .env (GOOGLE_GEMINI_BASE_URL and GEMINI_API_KEY are not allowed)",
+    "extractFromCurrent": "Extract from Editor",
+    "extractNoCommonConfig": "No common config available to extract from editor",
+    "extractFailed": "Extract failed: {{error}}",
+    "saveFailed": "Save failed: {{error}}",
     "extractedConfigInvalid": "Extracted config format is invalid",
     "invalidJsonFormat": "Common config snippet format error (must be valid JSON)",
+    "commonConfigInvalidKeys": "Common config snippet must not include GOOGLE_GEMINI_BASE_URL or GEMINI_API_KEY (found: {{keys}})",
+    "commonConfigInvalidValues": "Common config snippet values must be strings",
     "noCommonConfigToApply": "Common config snippet is empty or has no applicable entries",
     "configMergeFailed": "Config merge failed: {{error}}",
     "configReplaceFailed": "Config replace failed: {{error}}"

src/i18n/locales/ja.json

@@ -51,8 +51,15 @@
   },
   "claudeConfig": {
     "configLabel": "Claude Code settings.json (JSON) *",
+    "writeCommonConfig": "共通設定を書き込む",
+    "editCommonConfig": "共通設定を編集",
+    "editCommonConfigTitle": "共通設定スニペットを編集",
+    "commonConfigHint": "「共通設定を書き込む」がオンのとき settings.json にマージされます",
     "fullSettingsHint": "Claude Code の settings.json 全文",
-    "fragmentSettingsHint": "このプロバイダーの設定スニペット。有効化時に settings.json に書き込まれます",
+    "extractFromCurrent": "編集内容から抽出",
+    "extractNoCommonConfig": "編集内容から抽出できる共通設定がありません",
+    "extractFailed": "抽出に失敗しました: {{error}}",
+    "saveFailed": "保存に失敗しました: {{error}}",
     "hideAttribution": "AI署名を非表示",
     "alwaysThinking": "拡張思考",
     "enableTeammates": "Teammates モード"
@@ -118,7 +125,11 @@
     "notes": "メモ",
     "notesPlaceholder": "例: 会社用アカウント",
     "configJson": "Config JSON",
+    "writeCommonConfig": "共通設定を書き込む",
+    "editCommonConfigButton": "共通設定を編集",
     "configJsonHint": "Claude Code の設定をすべて入力してください",
+    "editCommonConfigTitle": "共通設定スニペットを編集",
+    "editCommonConfigHint": "共通設定スニペットは、この機能をオンにしたすべてのプロバイダーへマージされます",
     "addProvider": "プロバイダーを追加",
     "sortUpdated": "並び順を更新しました",
     "usageSaved": "利用状況の設定を保存しました",
@@ -669,10 +680,6 @@
     "apiFormatHint": "プロバイダー API の入力フォーマットを選択",
     "apiFormatAnthropic": "Anthropic Messages（ネイティブ）",
     "apiFormatOpenAIChat": "OpenAI Chat Completions（プロキシが必要）",
-    "authField": "認証フィールド",
-    "authFieldAuthToken": "Auth Token（デフォルト）",
-    "authFieldApiKey": "API Key",
-    "authFieldHint": "ほとんどのサードパーティプロバイダーは Auth Token を使用します。一部は API Key が必要です",
     "anthropicDefaultHaikuModel": "既定 Haiku モデル",
     "anthropicDefaultSonnetModel": "既定 Sonnet モデル",
     "anthropicDefaultOpusModel": "既定 Opus モデル",
@@ -744,15 +751,33 @@
     "authJsonHint": "Codex の auth.json 設定内容",
     "configToml": "config.toml (TOML)",
     "configTomlHint": "Codex の config.toml 設定内容",
-    "apiUrlLabel": "API リクエスト URL"
+    "writeCommonConfig": "共通設定を書き込む",
+    "editCommonConfig": "共通設定を編集",
+    "editCommonConfigTitle": "Codex 共通設定スニペットを編集",
+    "commonConfigHint": "「共通設定を書き込む」がオンの場合、config.toml の末尾に追記されます",
+    "apiUrlLabel": "API リクエスト URL",
+    "extractFromCurrent": "編集内容から抽出",
+    "extractNoCommonConfig": "編集内容から抽出できる共通設定がありません",
+    "extractFailed": "抽出に失敗しました: {{error}}",
+    "saveFailed": "保存に失敗しました: {{error}}"
   },
   "geminiConfig": {
     "envFile": "環境変数 (.env)",
     "envFileHint": ".env 形式で Gemini の環境変数を設定",
     "configJson": "設定ファイル (config.json)",
     "configJsonHint": "Gemini 拡張パラメーターを JSON 形式で設定（任意）",
+    "writeCommonConfig": "共通設定を書き込む",
+    "editCommonConfig": "共通設定を編集",
+    "editCommonConfigTitle": "Gemini 共通設定スニペットを編集",
+    "commonConfigHint": "このスニペットは Gemini の .env に書き込みます（GOOGLE_GEMINI_BASE_URL、GEMINI_API_KEY は使用できません）",
+    "extractFromCurrent": "編集内容から抽出",
+    "extractNoCommonConfig": "編集内容から抽出できる共通設定がありません",
+    "extractFailed": "抽出に失敗しました: {{error}}",
+    "saveFailed": "保存に失敗しました: {{error}}",
     "extractedConfigInvalid": "抽出した設定のフォーマットが不正です",
     "invalidJsonFormat": "共通設定スニペットの形式が不正です（有効な JSON でなければなりません）",
+    "commonConfigInvalidKeys": "共通設定スニペットに GOOGLE_GEMINI_BASE_URL または GEMINI_API_KEY を含めることはできません（検出: {{keys}}）",
+    "commonConfigInvalidValues": "共通設定スニペットの値は文字列である必要があります",
     "noCommonConfigToApply": "共通設定スニペットが空、または適用できる項目がありません",
     "configMergeFailed": "設定のマージに失敗しました: {{error}}",
     "configReplaceFailed": "設定の置換に失敗しました: {{error}}"

src/i18n/locales/zh.json

@@ -51,8 +51,15 @@
   },
   "claudeConfig": {
     "configLabel": "Claude Code 配置 (JSON) *",
+    "writeCommonConfig": "写入通用配置",
+    "editCommonConfig": "编辑通用配置",
+    "editCommonConfigTitle": "编辑通用配置片段",
+    "commonConfigHint": "该片段会在勾选\"写入通用配置\"时合并到 settings.json 中",
     "fullSettingsHint": "完整的 Claude Code settings.json 配置内容",
-    "fragmentSettingsHint": "此供应商的配置片段，激活后将写入 settings.json",
+    "extractFromCurrent": "从编辑内容提取",
+    "extractNoCommonConfig": "当前编辑内容没有可提取的通用配置",
+    "extractFailed": "提取失败: {{error}}",
+    "saveFailed": "保存失败: {{error}}",
     "hideAttribution": "隐藏 AI 署名",
     "alwaysThinking": "扩展思考",
     "enableTeammates": "Teammates 模式"
@@ -118,7 +125,11 @@
     "notes": "备注",
     "notesPlaceholder": "例如：公司专用账号",
     "configJson": "配置 JSON",
+    "writeCommonConfig": "写入通用配置",
+    "editCommonConfigButton": "编辑通用配置",
     "configJsonHint": "请填写完整的 Claude Code 配置",
+    "editCommonConfigTitle": "编辑通用配置片段",
+    "editCommonConfigHint": "通用配置片段将合并到所有启用它的供应商配置中",
     "addProvider": "添加供应商",
     "sortUpdated": "排序已更新",
     "usageSaved": "用量查询配置已保存",
@@ -669,10 +680,6 @@
     "apiFormatHint": "选择供应商 API 的输入格式",
     "apiFormatAnthropic": "Anthropic Messages (原生)",
     "apiFormatOpenAIChat": "OpenAI Chat Completions (需开启代理)",
-    "authField": "认证字段",
-    "authFieldAuthToken": "Auth Token (默认)",
-    "authFieldApiKey": "API Key",
-    "authFieldHint": "大多数第三方供应商使用 Auth Token；少数供应商需要 API Key",
     "anthropicDefaultHaikuModel": "Haiku 默认模型",
     "anthropicDefaultSonnetModel": "Sonnet 默认模型",
     "anthropicDefaultOpusModel": "Opus 默认模型",
@@ -744,15 +751,33 @@
     "authJsonHint": "Codex auth.json 配置内容",
     "configToml": "config.toml (TOML)",
     "configTomlHint": "Codex config.toml 配置内容",
-    "apiUrlLabel": "API 请求地址"
+    "writeCommonConfig": "写入通用配置",
+    "editCommonConfig": "编辑通用配置",
+    "editCommonConfigTitle": "编辑 Codex 通用配置片段",
+    "commonConfigHint": "该片段会在勾选'写入通用配置'时追加到 config.toml 末尾",
+    "apiUrlLabel": "API 请求地址",
+    "extractFromCurrent": "从编辑内容提取",
+    "extractNoCommonConfig": "当前编辑内容没有可提取的通用配置",
+    "extractFailed": "提取失败: {{error}}",
+    "saveFailed": "保存失败: {{error}}"
   },
   "geminiConfig": {
     "envFile": "环境变量 (.env)",
     "envFileHint": "使用 .env 格式配置 Gemini 环境变量",
     "configJson": "配置文件 (config.json)",
     "configJsonHint": "使用 JSON 格式配置 Gemini 扩展参数（可选）",
+    "writeCommonConfig": "写入通用配置",
+    "editCommonConfig": "编辑通用配置",
+    "editCommonConfigTitle": "编辑 Gemini 通用配置片段",
+    "commonConfigHint": "该片段会写入 Gemini 的 .env（不允许包含 GOOGLE_GEMINI_BASE_URL、GEMINI_API_KEY）",
+    "extractFromCurrent": "从编辑内容提取",
+    "extractNoCommonConfig": "当前编辑内容没有可提取的通用配置",
+    "extractFailed": "提取失败: {{error}}",
+    "saveFailed": "保存失败: {{error}}",
     "extractedConfigInvalid": "提取的配置格式错误",
     "invalidJsonFormat": "通用配置片段格式错误（必须是有效的 JSON）",
+    "commonConfigInvalidKeys": "通用配置片段不能包含 GOOGLE_GEMINI_BASE_URL 或 GEMINI_API_KEY（发现：{{keys}}）",
+    "commonConfigInvalidValues": "通用配置片段的值必须是字符串",
     "noCommonConfigToApply": "通用配置片段为空或没有可写入的内容",
     "configMergeFailed": "配置合并失败: {{error}}",
     "configReplaceFailed": "配置替换失败: {{error}}"