refactor(database): DbMigrator.cs에 KIS 수집 테이블 스키마 초기화 추가

- kis_collection_runs, kis_collection_snapshots, kis_collection_errors 테이블 정의를 DbMigrator.cs의 Migrate()에 추가.
- 이를 통해 수집기가 시작되거나 API를 호출하기 전에 스키마가 데이터베이스 초기화 시점에 안전하게 준비되도록 함.

src/dotnet/QuantEngine.Infrastructure/Data/DbMigrator.cs

@@ -105,6 +105,44 @@ namespace QuantEngine.Infrastructure.Data
                 CREATE INDEX IF NOT EXISTS idx_collection_source_errors_run ON collection_source_errors(run_id, source_name);
             ");
 
+            // 3b. KIS 데이터 수집 테이블 추가 (kis_collection_runs, kis_collection_snapshots, kis_collection_errors)
+            conn.Execute(@"
+                CREATE TABLE IF NOT EXISTS kis_collection_runs (
+                    run_id TEXT PRIMARY KEY,
+                    status TEXT NOT NULL,
+                    started_at TEXT NOT NULL,
+                    finished_at TEXT,
+                    total_snapshots INTEGER,
+                    total_errors INTEGER,
+                    updated_at TEXT NOT NULL
+                );
+                CREATE INDEX IF NOT EXISTS idx_kis_runs_started_at ON kis_collection_runs(started_at DESC);
+
+                CREATE TABLE IF NOT EXISTS kis_collection_snapshots (
+                    run_id TEXT NOT NULL,
+                    dataset_name TEXT,
+                    ticker TEXT NOT NULL,
+                    source_name TEXT NOT NULL,
+                    payload_json TEXT NOT NULL,
+                    captured_at TEXT NOT NULL,
+                    created_at TEXT NOT NULL,
+                    PRIMARY KEY (run_id, ticker, source_name)
+                );
+                CREATE INDEX IF NOT EXISTS idx_kis_snapshots_ticker ON kis_collection_snapshots(ticker);
+                CREATE INDEX IF NOT EXISTS idx_kis_snapshots_captured_at ON kis_collection_snapshots(captured_at DESC);
+
+                CREATE TABLE IF NOT EXISTS kis_collection_errors (
+                    id SERIAL PRIMARY KEY,
+                    run_id TEXT NOT NULL,
+                    source_name TEXT NOT NULL,
+                    error_kind TEXT NOT NULL,
+                    error_message TEXT,
+                    ticker TEXT,
+                    created_at TEXT NOT NULL
+                );
+                CREATE INDEX IF NOT EXISTS idx_kis_errors_run_id ON kis_collection_errors(run_id);
+            ");
+
             // 4. settings
             conn.Execute(@"
                 CREATE TABLE IF NOT EXISTS settings (