v0.7.3: 重构 Provider 层 + 计算层隔离 + Cleaner/NoMemory 架构

- 删除 OpenAIProvider/OllamaProvider 死代码，LuaAdaptedProvider 独存
- DisableThinking 从 ExtraBody 移到 CompletionRequest 顶层字段
- ContextWindow 从 Provider 签名移到 BaseConfig/ModelContextWindow() 统管
- 确认 CleanText 仅做基本空白 trim，QQ 模板剥离归插件 Cleaner
- Cleaner/NoMemory 仅作用于向量计算和 jieba 分词层，原文不变
- context.ContextEvent/Doc.Content 始终保存原文
- 删除 nlp/download.go 死代码
- media.go: context.Background() -> a.ctx 级联
- clawhubadapter: HTTP 超时
- cut.go: 跨平台 mod cache 路径 (GOMODCACHE->GOPATH->HomeDir)
- bridge_e2e_test: 移除未用 runtime import
- lua 适配器: disable_thinking 传参

internal/agent/core/process.go

@@ -60,16 +60,12 @@ func (a *Agent) process(input string, stageCtx *sdk.StageContext) (response stri
 			})
 		}
 
-		eb := map[string]interface{}{}
-		if !a.thinkingEnabled {
-			eb["thinking"] = map[string]interface{}{"type": "disabled"}
-		}
 		req := &agentAPI.CompletionRequest{
-			Messages:   msgs,
-			MaxTokens:  4096,
-			Tools:      tools,
-			ToolChoice: "auto",
-			ExtraBody:  eb,
+			Messages:        msgs,
+			MaxTokens:       4096,
+			Tools:           tools,
+			ToolChoice:      "auto",
+			DisableThinking: !a.thinkingEnabled,
 		}
 
 		var providers []agentAPI.Provider