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

cmd/homed/main.go

@@ -278,11 +278,12 @@ func main() {
 			key = baseAPIKey
 		}
 		luaProvider := agentAPI.NewLuaAdaptedProvider(agentAPI.BaseConfig{
-			Model:       src.Model,
-			BaseURL:     src.BaseURL,
-			APIKey:      key,
-			Temperature: cfg.LLM.Temperature,
-			MaxTokens:   cfg.LLM.MaxTokens,
+			Model:         src.Model,
+			BaseURL:       src.BaseURL,
+			APIKey:        key,
+			Temperature:   cfg.LLM.Temperature,
+			MaxTokens:     cfg.LLM.MaxTokens,
+			ContextWindow: src.ContextWindow,
 		}, luaVM, src.Adapter)
 		providerMgr.Register(src.Name, luaProvider)
 	}