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>

src/utils/patterns.ts

@@ -18,6 +18,7 @@ export const TROUBLESHOOT_PATTERNS = /문제|에러|오류|안[돼되]|느려|
 export const WEATHER_PATTERNS = /날씨|기온|비|눈|맑|흐림|더워|추워/i;
 export const SEARCH_PATTERNS = /검색|찾아|뭐야|뉴스|최신/i;
 export const REDDIT_PATTERNS = /레딧|reddit|서브레딧|subreddit/i;
+export const DDOS_PATTERNS = /ddos|DDoS|공격|트래픽\s*폭주|서비스\s*마비|봇\s*공격|디도스|대역폭\s*공격/i;
 
 // ============================================================================
 // Memory Category Patterns
@@ -104,6 +105,7 @@ export function detectToolCategories(text: string): string[] {
   if (DEPOSIT_PATTERNS.test(text)) categories.push('deposit');
   if (SERVER_PATTERNS.test(text)) categories.push('server');
   if (TROUBLESHOOT_PATTERNS.test(text)) categories.push('troubleshoot');
+  if (DDOS_PATTERNS.test(text)) categories.push('ddos');
   if (WEATHER_PATTERNS.test(text)) categories.push('weather');
   if (SEARCH_PATTERNS.test(text)) categories.push('search');
   if (REDDIT_PATTERNS.test(text)) categories.push('reddit');