refactor: delete server-agent.ts (905 lines)

Remove server recommendation consultation system:
- 30-year expert AI persona
- Session-based information gathering
- Brave Search / Context7 tool integration
- Automatic spec inference

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

migrations/010_add_ddos_sessions.sql

@@ -0,0 +1,19 @@
+-- Migration: Add DDoS Defense Sessions Table
+-- Created: 2026-02-05
+-- Description: Stores DDoS defense consultation sessions
+
+CREATE TABLE IF NOT EXISTS ddos_sessions (
+  user_id TEXT PRIMARY KEY,
+  status TEXT NOT NULL CHECK(status IN ('gathering', 'analyzing', 'recommending', 'completed')),
+  collected_info TEXT, -- JSON: { attack_type?: string, target?: string, symptoms?: string[], traffic_volume?: string }
+  messages TEXT, -- JSON: [{ role: 'user' | 'assistant', content: string }]
+  created_at INTEGER NOT NULL,
+  updated_at INTEGER NOT NULL,
+  expires_at INTEGER NOT NULL
+);
+
+-- Index for cleanup queries (expired sessions)
+CREATE INDEX IF NOT EXISTS idx_ddos_sessions_expires_at ON ddos_sessions(expires_at);
+
+-- Index for status queries (optional, for analytics)
+CREATE INDEX IF NOT EXISTS idx_ddos_sessions_status ON ddos_sessions(status);

migrations/011_fix_ddos_session_status.sql

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+-- Migration: Fix DDoS Session Status Constraint
+-- Created: 2026-02-05
+-- Description: Update status check constraint to match TypeScript types
+
+-- SQLite doesn't support ALTER TABLE to modify CHECK constraints
+-- So we need to recreate the table with correct constraint
+
+-- Step 1: Create new table with correct constraint
+CREATE TABLE IF NOT EXISTS ddos_sessions_new (
+  user_id TEXT PRIMARY KEY,
+  status TEXT NOT NULL CHECK(status IN ('gathering', 'analyzing', 'mitigating', 'monitoring', 'completed')),
+  collected_info TEXT,
+  messages TEXT,
+  created_at INTEGER NOT NULL,
+  updated_at INTEGER NOT NULL,
+  expires_at INTEGER NOT NULL
+);
+
+-- Step 2: Copy data from old table (if exists)
+INSERT OR IGNORE INTO ddos_sessions_new
+SELECT user_id,
+       CASE
+         WHEN status = 'recommending' THEN 'analyzing'
+         ELSE status
+       END as status,
+       collected_info, messages, created_at, updated_at, expires_at
+FROM ddos_sessions;
+
+-- Step 3: Drop old table
+DROP TABLE IF EXISTS ddos_sessions;
+
+-- Step 4: Rename new table
+ALTER TABLE ddos_sessions_new RENAME TO ddos_sessions;
+
+-- Step 5: Recreate indexes
+CREATE INDEX IF NOT EXISTS idx_ddos_sessions_expires_at ON ddos_sessions(expires_at);
+CREATE INDEX IF NOT EXISTS idx_ddos_sessions_status ON ddos_sessions(status);