feat: 대역폭 추정 및 DAU 표시 기능 추가

- 동시접속자 기반 월간 대역폭 자동 추정
- DAU(일일활성사용자) 추정치 표시 (동접 × 10-14)
- 대역폭 기반 Linode/Vultr 자동 선택 로직
- 비용 분석에 대역폭 비용 포함
- 지역 미선택시 서울/도쿄/오사카/싱가포르 기본 표시
- 지역별 서버 분리 표시 (GROUP BY instance + region)

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

src/types.ts

@@ -0,0 +1,92 @@
+/**
+ * Type definitions for Server Recommendation API
+ */
+
+/**
+ * Server requirements provided by user
+ */
+export interface ServerRequirements {
+  cpu: string;           // e.g., "4 cores", "8 vCPU"
+  memory: string;        // e.g., "16GB", "32GB RAM"
+  storage: string;       // e.g., "500GB SSD", "1TB NVMe"
+  network: string;       // e.g., "1Gbps", "10Gbps unmetered"
+  availability: string;  // e.g., "99.9%", "enterprise SLA"
+  budget: string;        // e.g., "$100/month", "under $200"
+}
+
+/**
+ * Server recommendation returned by AI
+ */
+export interface ServerRecommendation {
+  provider: string;      // Hosting provider name
+  plan: string;          // Specific plan/product name
+  cpu: string;           // CPU specifications
+  memory: string;        // RAM specifications
+  storage: string;       // Storage specifications
+  network: string;       // Network specifications
+  price: string;         // Monthly cost
+  availability: string;  // SLA or uptime guarantee
+  reason: string;        // Why this server was recommended
+  matchScore: number;    // Match score (0-100)
+}
+
+/**
+ * API request body for recommendations
+ */
+export interface RecommendationRequest {
+  requirements: ServerRequirements;
+}
+
+/**
+ * API response for recommendations
+ */
+export interface RecommendationResponse {
+  recommendations: ServerRecommendation[];
+  cached: boolean;
+  timestamp: string;
+}
+
+/**
+ * Error response structure
+ */
+export interface ErrorResponse {
+  error: string;
+  message: string;
+  timestamp: string;
+}
+
+/**
+ * Cloudflare Worker environment bindings
+ */
+export interface Env {
+  AI: Ai;                // Workers AI binding
+  DB: D1Database;        // D1 database binding
+  CACHE?: KVNamespace;   // KV namespace binding (optional)
+}
+
+/**
+ * D1 database row for server catalog
+ */
+export interface ServerCatalogRow {
+  id: number;
+  provider: string;
+  plan: string;
+  cpu: string;
+  memory: string;
+  storage: string;
+  network: string;
+  price: string;
+  availability: string;
+  features: string;      // JSON string of additional features
+  created_at: string;
+  updated_at: string;
+}
+
+/**
+ * Cache entry structure
+ */
+export interface CacheEntry {
+  recommendations: ServerRecommendation[];
+  timestamp: string;
+  ttl: number;
+}