feat: adaptive reasoning detection for Codex Chat providers

Auto-detect each Chat-routed Codex provider's reasoning interface from
its name, base URL, and model, then inject the matching thinking
parameter without manual configuration:

- Platform-first inference (OpenRouter, SiliconFlow) overrides model
  rules, since the same model exposes different reasoning controls
  depending on the hosting platform.
- Effort tiers are forwarded only to providers that support them
  (DeepSeek, OpenRouter, and StepFun's step-3.5-flash-2603); on/off-only
  providers (Kimi, GLM, Qwen, MiniMax, MiMo, SiliconFlow) drop the level
  instead of sending a field the upstream rejects.
- OpenRouter uses the native reasoning:{effort} object, clamps max to
  xhigh (its enum has no max), and forwards an explicit effort:"none" so
  reasoning can be turned off.
- StepFun falls back to inference so per-model effort support is honored
  (the static preset would have forced effort on step-3.5-flash too).

Includes the Codex provider-form reasoning controls, i18n strings
(zh/en/ja), and response-side reasoning extraction.

src-tauri/src/provider.rs

@@ -261,6 +261,26 @@ pub struct ClaudeDesktopModelRoute {
     pub supports_1m: Option<bool>,
 }
 
+/// Codex Responses -> Chat Completions 的 reasoning 能力描述。
+#[derive(Debug, Clone, Serialize, Deserialize, Default, PartialEq, Eq)]
+pub struct CodexChatReasoningConfig {
+    #[serde(rename = "supportsThinking", skip_serializing_if = "Option::is_none")]
+    pub supports_thinking: Option<bool>,
+    #[serde(rename = "supportsEffort", skip_serializing_if = "Option::is_none")]
+    pub supports_effort: Option<bool>,
+    #[serde(rename = "thinkingParam", skip_serializing_if = "Option::is_none")]
+    pub thinking_param: Option<String>,
+    #[serde(rename = "effortParam", skip_serializing_if = "Option::is_none")]
+    pub effort_param: Option<String>,
+    #[serde(rename = "effortValueMode", skip_serializing_if = "Option::is_none")]
+    pub effort_value_mode: Option<String>,
+    /// 声明性字段：标注上游 reasoning 的回传位置（reasoning_content / reasoning /
+    /// reasoning_details / think_tags）。当前响应侧 `extract_reasoning_field_text`
+    /// 靠穷举字段提取、并不读取本字段；保留作文档说明与未来按格式分发（如 think_tags）的预留。
+    #[serde(rename = "outputFormat", skip_serializing_if = "Option::is_none")]
+    pub output_format: Option<String>,
+}
+
 /// 供应商元数据
 #[derive(Debug, Clone, Serialize, Deserialize, Default)]
 pub struct ProviderMeta {
@@ -339,6 +359,9 @@ pub struct ProviderMeta {
     /// Codex OAuth FAST mode: inject `service_tier = "priority"` for ChatGPT Codex requests.
     #[serde(rename = "codexFastMode", skip_serializing_if = "Option::is_none")]
     pub codex_fast_mode: Option<bool>,
+    /// Codex Responses -> Chat Completions reasoning capability metadata.
+    #[serde(rename = "codexChatReasoning", skip_serializing_if = "Option::is_none")]
+    pub codex_chat_reasoning: Option<CodexChatReasoningConfig>,
     /// 累加模式应用中，该 provider 是否已写入 live config。
     /// `None` 表示旧数据/未知状态，`Some(false)` 表示明确仅存在于数据库中。
     #[serde(rename = "liveConfigManaged", skip_serializing_if = "Option::is_none")]