feat: 添加编译时模块开关配置

通过 sdkconfig.defaults 选择性启用/禁用模块，减少固件体积：

新增模块开关：
- CONFIG_MIMI_CHAN_TELEGRAM (默认 n)
- CONFIG_MIMI_CHAN_FEISHU (默认 y)
- CONFIG_MIMI_TOOL_WEB_SEARCH (默认 y)
- CONFIG_MIMI_TOOL_GPIO (默认 n)
- CONFIG_MIMI_WS_SERVER (默认 y)
- CONFIG_MIMI_WIFI_ONBOARD (默认 y)
- CONFIG_MIMI_OTA (默认 n)

技术实现：
- CMakeLists.txt 条件编译源文件
- 头文件使用 static inline stub
- CLI 命令和工具注册也支持条件编译

消除 Telegram 未配置时的 5 秒轮询警告日志

main/tools/tool_gpio.h

@@ -2,26 +2,34 @@
 
 #include "esp_err.h"
 #include <stddef.h>
+#include <stdio.h>
 
-/**
- * Initialize GPIO tool — configure allowed pins and directions.
- */
+#ifdef CONFIG_MIMI_TOOL_GPIO
 esp_err_t tool_gpio_init(void);
-
-/**
- * Write a GPIO pin HIGH or LOW.
- * Input JSON: {"pin": <int>, "state": <0|1>}
- */
 esp_err_t tool_gpio_write_execute(const char *input_json, char *output, size_t output_size);
-
-/**
- * Read a single GPIO pin state.
- * Input JSON: {"pin": <int>}
- */
 esp_err_t tool_gpio_read_execute(const char *input_json, char *output, size_t output_size);
-
-/**
- * Read all allowed GPIO pin states at once.
- * Input JSON: {} (no parameters)
- */
 esp_err_t tool_gpio_read_all_execute(const char *input_json, char *output, size_t output_size);
+#else
+static inline esp_err_t tool_gpio_init(void) { return ESP_OK; }
+static inline esp_err_t tool_gpio_write_execute(const char *input_json, char *output, size_t output_size) {
+    (void)input_json; (void)output; (void)output_size;
+    if (output && output_size > 0) {
+        snprintf(output, output_size, "Error: GPIO tool is disabled in this build.");
+    }
+    return ESP_OK;
+}
+static inline esp_err_t tool_gpio_read_execute(const char *input_json, char *output, size_t output_size) {
+    (void)input_json; (void)output; (void)output_size;
+    if (output && output_size > 0) {
+        snprintf(output, output_size, "Error: GPIO tool is disabled in this build.");
+    }
+    return ESP_OK;
+}
+static inline esp_err_t tool_gpio_read_all_execute(const char *input_json, char *output, size_t output_size) {
+    (void)input_json; (void)output; (void)output_size;
+    if (output && output_size > 0) {
+        snprintf(output, output_size, "Error: GPIO tool is disabled in this build.");
+    }
+    return ESP_OK;
+}
+#endif

main/tools/tool_registry.c

@@ -59,6 +59,7 @@ esp_err_t tool_registry_init(void)
     s_tool_count = 0;
 
     /* Register web_search */
+#ifdef CONFIG_MIMI_TOOL_WEB_SEARCH
     tool_web_search_init();
 
     mimi_tool_t ws = {
@@ -71,6 +72,7 @@ esp_err_t tool_registry_init(void)
         .execute = tool_web_search_execute,
     };
     register_tool(&ws);
+#endif
 
     /* Register get_current_time */
     mimi_tool_t gt = {
@@ -192,6 +194,7 @@ esp_err_t tool_registry_init(void)
     register_tool(&cr);
 
     /* Register GPIO tools */
+#ifdef CONFIG_MIMI_TOOL_GPIO
     tool_gpio_init();
 
     mimi_tool_t gw = {
@@ -227,6 +230,7 @@ esp_err_t tool_registry_init(void)
         .execute = tool_gpio_read_all_execute,
     };
     register_tool(&ga);
+#endif
 
     build_tools_json();
 

main/tools/tool_web_search.h

@@ -2,28 +2,28 @@
 
 #include "esp_err.h"
 #include <stddef.h>
+#include <stdio.h>
 
-/**
- * Initialize web search tool.
- */
+#ifdef CONFIG_MIMI_TOOL_WEB_SEARCH
 esp_err_t tool_web_search_init(void);
-
-/**
- * Execute a web search.
- *
- * @param input_json   JSON string with "query" field
- * @param output       Output buffer for formatted search results
- * @param output_size  Size of output buffer
- * @return ESP_OK on success
- */
 esp_err_t tool_web_search_execute(const char *input_json, char *output, size_t output_size);
-
-/**
- * Save Brave Search API key to NVS.
- */
 esp_err_t tool_web_search_set_key(const char *api_key);
-
-/**
- * Save Tavily API key to NVS.
- */
 esp_err_t tool_web_search_set_tavily_key(const char *api_key);
+#else
+static inline esp_err_t tool_web_search_init(void) { return ESP_OK; }
+static inline esp_err_t tool_web_search_execute(const char *input_json, char *output, size_t output_size) {
+    (void)input_json; (void)output; (void)output_size;
+    if (output && output_size > 0) {
+        snprintf(output, output_size, "Error: Web search tool is disabled in this build.");
+    }
+    return ESP_OK;
+}
+static inline esp_err_t tool_web_search_set_key(const char *api_key) {
+    (void)api_key;
+    return ESP_OK;
+}
+static inline esp_err_t tool_web_search_set_tavily_key(const char *api_key) {
+    (void)api_key;
+    return ESP_OK;
+}
+#endif