feat: enhance audit logging, add MCP settings, and production docker setup

- Implemented comprehensive audit logging for Tasks, Users, Settings, Goals, Labels, AI Chat, and Rewards.
- Added Admin UI for MCP Server settings and Audit Logs.
- Created docker-compose-production.yml with Traefik configuration.
- Fixed backend bugs (missing storage methods, route closure).
- Added Audit Logging Guidelines.

migration.sql

@@ -6,12 +6,31 @@ CREATE TABLE IF NOT EXISTS system_settings (
     updated_at timestamp DEFAULT now()
 );
 
+-- AI Chat Tables
+CREATE TABLE IF NOT EXISTS conversations (
+    id varchar(255) PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_id varchar(255) NOT NULL REFERENCES users(id),
+    title text NOT NULL,
+    created_at timestamp DEFAULT now(),
+    updated_at timestamp DEFAULT now()
+);
+
+CREATE TABLE IF NOT EXISTS messages (
+    id varchar(255) PRIMARY KEY DEFAULT gen_random_uuid(),
+    conversation_id varchar(255) NOT NULL REFERENCES conversations(id),
+    role text NOT NULL,
+    content text NOT NULL,
+    created_at timestamp DEFAULT now()
+);
+
 -- Truncate users to avoid constraint issues and reset for First Run
 TRUNCATE TABLE users CASCADE;
 TRUNCATE TABLE user_rewards CASCADE;
 TRUNCATE TABLE xp_events CASCADE;
 TRUNCATE TABLE goals CASCADE;
 TRUNCATE TABLE notes CASCADE;
+TRUNCATE TABLE conversations CASCADE;
+TRUNCATE TABLE messages CASCADE;
 
 -- Add new columns to users
 ALTER TABLE users ADD COLUMN IF NOT EXISTS email text NOT NULL UNIQUE;