fix: 添加 Kconfig.projbuild 修复模块开关失效问题

- 创建 main/Kconfig.projbuild 声明所有自定义模块配置项
- 修复 fullclean 后 sdkconfig 丢失 CONFIG_MIMI_* 配置的问题
- 更新 AGENTS.md 添加认知修正栏目和模块开关文档
- 记录 Kconfig 踩坑讨论到 taolun.md

main/Kconfig.projbuild

@@ -0,0 +1,51 @@
+menu "MimiClaw Configuration"
+
+menu "Channel Modules"
+    config MIMI_CHAN_TELEGRAM
+        bool "Telegram bot integration"
+        default n
+        help
+            Enable Telegram bot integration for MimiClaw.
+
+    config MIMI_CHAN_FEISHU
+        bool "Feishu (Lark) bot integration"
+        default y
+        help
+            Enable Feishu (Lark) bot integration for MimiClaw.
+endmenu
+
+menu "Tool Modules"
+    config MIMI_TOOL_WEB_SEARCH
+        bool "Web search tool"
+        default y
+        help
+            Enable web search tool (requires search API key).
+
+    config MIMI_TOOL_GPIO
+        bool "GPIO control tool"
+        default n
+        help
+            Enable GPIO control tool for hardware control.
+endmenu
+
+menu "Optional Modules"
+    config MIMI_WS_SERVER
+        bool "WebSocket gateway"
+        default y
+        help
+            Enable WebSocket gateway for local clients.
+
+    config MIMI_WIFI_ONBOARD
+        bool "WiFi onboarding portal"
+        default y
+        help
+            Enable Captive Portal for initial WiFi setup.
+
+    config MIMI_OTA
+        bool "OTA firmware update"
+        default n
+        help
+            Enable OTA firmware update (not fully implemented).
+endmenu
+
+endmenu