feat: wire up app_main with all subsystems

Startup sequence: NVS → SPIFFS → bus → memory → WiFi → CLI →
Telegram → agent loop → WebSocket → outbound dispatch.
CMakeLists registers all source files and ESP-IDF dependencies.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

main/CMakeLists.txt

@@ -1,2 +1,20 @@
-idf_component_register(SRCS "mimi.c"
-                    INCLUDE_DIRS ".")
+idf_component_register(
+    SRCS
+        "mimi.c"
+        "bus/message_bus.c"
+        "wifi/wifi_manager.c"
+        "telegram/telegram_bot.c"
+        "llm/llm_proxy.c"
+        "agent/agent_loop.c"
+        "agent/context_builder.c"
+        "memory/memory_store.c"
+        "memory/session_mgr.c"
+        "gateway/ws_server.c"
+        "cli/serial_cli.c"
+        "ota/ota_manager.c"
+    INCLUDE_DIRS
+        "."
+    REQUIRES
+        nvs_flash esp_wifi esp_netif esp_http_client esp_http_server
+        esp_https_ota esp_event json spiffs console vfs
+)