feat: add server provisioning system with Queue

- Add server-provision.ts for async server creation
- Add SERVER_PROVISION_QUEUE with DLQ for reliability
- Add cron job for auto-cleanup of pending orders (5min)
- Add server delete confirmation with inline keyboard
- Update types for server orders, images, and provisioning
- Add server tables to schema (server_orders, server_instances)

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

schema.sql

@@ -86,6 +86,59 @@ CREATE TABLE IF NOT EXISTS deposit_transactions (
   FOREIGN KEY (user_id) REFERENCES users(id)
 );
 
+-- 서버 상담 세션 테이블
+CREATE TABLE IF NOT EXISTS server_sessions (
+  user_id TEXT PRIMARY KEY,
+  status TEXT NOT NULL CHECK(status IN ('gathering', 'recommending', 'selecting', 'ordering', 'completed')),
+  collected_info TEXT,
+  last_recommendation TEXT,
+  messages TEXT,
+  created_at INTEGER NOT NULL,
+  updated_at INTEGER NOT NULL,
+  expires_at INTEGER NOT NULL
+);
+
+-- 서버 주문 테이블
+CREATE TABLE IF NOT EXISTS server_orders (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  user_id INTEGER NOT NULL,
+  telegram_user_id TEXT NOT NULL,
+  spec_id INTEGER NOT NULL,
+  region TEXT NOT NULL,
+  label TEXT,
+  price_paid INTEGER NOT NULL,
+  status TEXT NOT NULL DEFAULT 'pending' CHECK(status IN ('pending', 'provisioning', 'active', 'failed', 'cancelled', 'terminated')),
+  provider TEXT NOT NULL CHECK(provider IN ('linode', 'vultr', 'anvil')),
+  provider_instance_id TEXT,
+  ip_address TEXT,
+  root_password TEXT,
+  error_message TEXT,
+  provisioned_at DATETIME,
+  created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+  updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+  idempotency_key TEXT UNIQUE,
+  FOREIGN KEY (user_id) REFERENCES users(id)
+);
+
+-- 사용자 서버 테이블 (활성 서버 관리)
+CREATE TABLE IF NOT EXISTS user_servers (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  user_id INTEGER NOT NULL,
+  order_id INTEGER NOT NULL UNIQUE,
+  provider TEXT NOT NULL,
+  instance_id TEXT NOT NULL,
+  label TEXT,
+  ip_address TEXT,
+  region TEXT,
+  spec_label TEXT,
+  monthly_price INTEGER,
+  status TEXT NOT NULL DEFAULT 'active' CHECK(status IN ('active', 'stopped', 'terminated')),
+  created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+  updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+  FOREIGN KEY (user_id) REFERENCES users(id),
+  FOREIGN KEY (order_id) REFERENCES server_orders(id)
+);
+
 -- 인덱스
 CREATE INDEX IF NOT EXISTS idx_user_domains_user ON user_domains(user_id);
 CREATE INDEX IF NOT EXISTS idx_user_domains_domain ON user_domains(domain);
@@ -100,3 +153,9 @@ CREATE INDEX IF NOT EXISTS idx_buffer_chat ON message_buffer(user_id, chat_id);
 CREATE INDEX IF NOT EXISTS idx_summary_user ON summaries(user_id, chat_id);
 CREATE INDEX IF NOT EXISTS idx_summary_latest ON summaries(user_id, chat_id, generation DESC);
 CREATE INDEX IF NOT EXISTS idx_users_telegram ON users(telegram_id);
+CREATE INDEX IF NOT EXISTS idx_server_sessions_expires ON server_sessions(expires_at);
+CREATE INDEX IF NOT EXISTS idx_server_orders_user ON server_orders(user_id);
+CREATE INDEX IF NOT EXISTS idx_server_orders_status ON server_orders(status);
+CREATE INDEX IF NOT EXISTS idx_server_orders_idempotency ON server_orders(idempotency_key) WHERE idempotency_key IS NOT NULL;
+CREATE INDEX IF NOT EXISTS idx_user_servers_user ON user_servers(user_id);
+CREATE INDEX IF NOT EXISTS idx_user_servers_status ON user_servers(status);