Refactor: remove unused cogs and services, simplify architecture

- Remove admin.py and search.py cogs
- Remove searxng.py service and rate_limiter.py utility
- Update bot.py, ai_chat.py, config.py, and ai_service.py
- Update documentation and docker-compose.yml

src/daemon_boyfriend/config.py

@@ -17,10 +17,6 @@ class Settings(BaseSettings):
 
     # Discord Configuration
     discord_token: str = Field(..., description="Discord bot token")
-    discord_guild_id: int | None = Field(
-        None, description="Test guild ID for faster command sync during development"
-    )
-    command_prefix: str = Field("!", description="Legacy command prefix")
 
     # AI Provider Configuration
     ai_provider: Literal["openai", "openrouter", "anthropic"] = Field(
@@ -35,25 +31,31 @@ class Settings(BaseSettings):
     openrouter_api_key: str | None = Field(None, description="OpenRouter API key")
     anthropic_api_key: str | None = Field(None, description="Anthropic API key")
 
-    # SearXNG Configuration
-    searxng_base_url: str = Field(
-        "http://localhost:8080", description="SearXNG instance URL"
-    )
-    searxng_timeout: int = Field(10, description="Search timeout in seconds")
-
-    # Rate Limiting
-    rate_limit_messages: int = Field(10, description="Messages per user per minute")
-    rate_limit_searches: int = Field(5, description="Searches per user per minute")
-
     # Logging
     log_level: str = Field("INFO", description="Logging level")
 
-    # Bot Behavior
-    bot_name: str = Field("Daemon Boyfriend", description="Bot display name")
+    # Bot Identity
+    bot_name: str = Field("AI Bot", description="Bot display name")
     bot_personality: str = Field(
-        "helpful, witty, and slightly mischievous",
+        "helpful and friendly",
         description="Bot personality description for system prompt",
     )
+    bot_description: str = Field(
+        "I'm an AI assistant here to help you.",
+        description="Bot description shown when mentioned without a message",
+    )
+    bot_status: str = Field(
+        "for mentions",
+        description="Bot status message (shown as 'Watching ...')",
+    )
+
+    # System Prompt (optional override)
+    system_prompt: str | None = Field(
+        None,
+        description="Custom system prompt. If not set, a default is generated from bot_name and bot_personality",
+    )
+
+    # Conversation Settings
     max_conversation_history: int = Field(
         20, description="Max messages to keep in conversation memory per user"
     )