feat: add project profiles for snapshot-based config switching

Add a profile feature that captures the current provider, MCP,
skills and prompt state for Claude Code and Codex as a named
snapshot, and re-applies it in one click from the header switcher
or the tray Projects submenu.

- New profiles table (schema v12) with current marker in settings
- ProfileService orchestrates the four existing switch primitives
  (provider first, then MCP diff, skills diff, prompt enable)
- Best-effort apply: dangling references become warnings, no rollback
- Header combobox switcher + snapshot-style manage dialog
- Tray Projects submenu shared with the UI apply/event pipeline
- i18n for zh/en/ja/zh-TW under the new profiles domain
- Integration tests covering roundtrip, dangling refs and clear

src-tauri/src/lib.rs

@@ -42,7 +42,7 @@ pub use codex_config::{get_codex_auth_path, get_codex_config_path, write_codex_l
 pub use commands::open_provider_terminal;
 pub use commands::*;
 pub use config::{get_claude_mcp_path, get_claude_settings_path, read_json_file};
-pub use database::Database;
+pub use database::{Database, Profile};
 pub use deeplink::{import_provider_from_deeplink, parse_deeplink_url, DeepLinkImportRequest};
 pub use error::AppError;
 pub use mcp::{
@@ -51,8 +51,10 @@ pub use mcp::{
     sync_enabled_to_codex, sync_enabled_to_gemini, sync_single_server_to_claude,
     sync_single_server_to_codex, sync_single_server_to_gemini,
 };
+pub use prompt::Prompt;
 pub use provider::{Provider, ProviderMeta};
 pub use services::{
+    profile::{ProfilePayload, ProfileService},
     skill::{migrate_skills_to_ssot, ImportSkillSelection},
     ConfigService, EndpointLatency, McpService, PromptService, ProviderService, ProxyService,
     SkillService, SpeedtestService,
@@ -1270,6 +1272,13 @@ pub fn run() {
             commands::enable_prompt,
             commands::import_prompt_from_file,
             commands::get_current_prompt_file_content,
+            // Profile management (项目配置方案)
+            commands::list_profiles,
+            commands::create_profile,
+            commands::update_profile,
+            commands::delete_profile,
+            commands::clear_current_profile,
+            commands::apply_profile,
             // model list fetch (OpenAI-compatible /v1/models)
             commands::fetch_models_for_config,
             // ours: endpoint speed test + custom endpoint management