feat(persona,model,loop): 人格 thinking 配置 + 5 个死字段接线 + 推理旋钮（按 provider 映射）

按 DevDocs/design/01 §2.1/§2.2 与 design/04 §3.2 实现（规格含联网核过的官方依据：思考内容刻意不角色化、不写分步思考指令、思考控制只走参数级）。
- 人格 schema 新增 thinking：budgetTokens / effort / showToUser(*bool，省略=nil=保持现行为，显式 false=只落库) / mode(default|on|off→Enable 三态)；非法 mode/负预算 → ErrInvalidThinking（不静默）
- 5 个死字段接上注入：personality→values→speechStyle→catchphrase→background 拼为独立段落（带【】小标题，空值不拼）；**全空时输出与旧实现逐字节一致**（有专门测试）
- model.Request 新增 Thinking{ BudgetTokens, Enable } 与 ReasoningEffort；新增 model/reasoning.go：厂商识别（模型名→baseURL 兜底）、取值白名单（OpenAI 系 none…max / DeepSeek low|high|max）、非法值降级+WARN、**不支持一律 WARN 而非静默**；Anthropic 映射 thinking{budget_tokens} 并**保证 budget<max_tokens**（不足时抬高 max_tokens+WARN，正是历史上思考吃光预算→空回复那个坑）
- loop：新增 Options.ThinkingShowToUser(*bool) 仅门控 thinking_* 帧（正文/工具帧不受影响）；场景级 mute 语义不变
- 补一处任务清单外但必需的接线：persona→model.Request 的 thinking 映射（否则 budget/effort/mode 会变成新的死字段）；showToUser 刻意不产生 Thinking（纯呈现开关）
- 管理端：personaUpsertRequest 补 thinking DTO + 校验（400）；PUT 省略时**保留已存块**（防旧客户端抹配置）；写侧 yaml round-trip 已验证
- Docs/api-client v0.40→v0.41（可选请求字段）
- 测试：26 个新用例（loader 解析/拼接逐字节/映射、anthropic 非流式+流式预算约束、openai 透传/降级/丢弃、Qwen 诚实 WARN、loop 门控、DTO round-trip）；3 次变异验证（省略与 false 混同 / 去掉预算约束 / 短路门控 各自 FAIL）
- 验收：go build/vet/test 全绿（含 57 包）+ linux/darwin 交叉编译 + 前端 build；唯一 FAIL 是既有 flake TestInterruptCancelsTurnAndClearsPending（3/20 新代码 vs 3/20 纯 HEAD，已归因非本次引入）

internal/runtime/model/openai_encode.go

@@ -15,6 +15,10 @@ type openAIChatRequest struct {
 	Stream        bool              `json:"stream,omitempty"`
 	StreamOptions *openAIStreamOpts `json:"stream_options,omitempty"`
 	Tools         []openAITool      `json:"tools,omitempty"`
+	// ReasoningEffort is the OpenAI-compatible reasoning strength knob. It is set
+	// only after validation against the detected vendor's whitelist (design/04
+	// §3.2); an unsupported value is downgraded or dropped, never forwarded as-is.
+	ReasoningEffort string `json:"reasoning_effort,omitempty"`
 }
 
 // openAIStreamOpts asks the provider to include usage in the final stream chunk.
@@ -66,13 +70,19 @@ func (a *OpenAIChatAdapter) buildRequest(req Request, stream bool) ([]byte, erro
 	if err != nil {
 		return nil, err
 	}
+	// The vendor behind an OpenAI-compatible endpoint decides which
+	// reasoning_effort tiers are legal; classify it from the resolved model (and
+	// the base URL as a fallback) before touching the request (design/04 §3.2).
+	vendor := reasoningVendorFor(req.Model, a.baseURL)
+	reportUnmappedThinking(a.log, vendor, req.Model, req.Thinking)
 	wire := openAIChatRequest{
-		Model:       req.Model,
-		Messages:    msgs,
-		Temperature: req.Temperature,
-		MaxTokens:   req.MaxTokens,
-		Stream:      stream,
-		Tools:       buildTools(req.Tools),
+		Model:           req.Model,
+		Messages:        msgs,
+		Temperature:     req.Temperature,
+		MaxTokens:       req.MaxTokens,
+		Stream:          stream,
+		Tools:           buildTools(req.Tools),
+		ReasoningEffort: resolveReasoningEffort(a.log, vendor, req.ReasoningEffort, req.Model),
 	}
 	if stream {
 		wire.StreamOptions = &openAIStreamOpts{IncludeUsage: true}