feat: builder 简历生成 + 轻度优化 + 简历导入交付副本

自内部仓库剥离深度优化与 RAG 知识库后的交付版本：
- Builder 对话式简历生成（FSM + 意图路由 LLM 兜底增强）
- 条目级轻度优化：事实覆盖门禁 + STAR/bullet 修复链，功能/简介/成果与技术栈同级保护
- 简历导入：DOCX/PDF 解析、结构归一、手机号脱敏
- PostgreSQL 运行时 + Alembic 迁移链

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

backend/scripts/migrate_sqlite_to_postgres.py

@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+import argparse
+import os
+from pathlib import Path
+
+from dotenv import load_dotenv
+
+from app.db.sqlite_migration import migrate_sqlite_to_postgres
+
+
+def main() -> None:
+    load_dotenv(Path(__file__).resolve().parents[1] / ".env", override=False)
+    parser = argparse.ArgumentParser(description="One-time SQLite to PostgreSQL Resume Agent migration")
+    parser.add_argument("source", type=Path, help="Path to the legacy SQLite database")
+    parser.add_argument("--database-url", default=os.getenv("DATABASE_URL"))
+    parser.add_argument("--schema", default="resume_agent")
+    parser.add_argument(
+        "--conflict-policy",
+        choices=("error", "update"),
+        default="error",
+    )
+    parser.add_argument("--dry-run", action="store_true")
+    args = parser.parse_args()
+    if not args.database_url:
+        parser.error("--database-url or DATABASE_URL is required")
+    report = migrate_sqlite_to_postgres(
+        args.source, args.database_url, schema=args.schema, dry_run=args.dry_run,
+        conflict_policy=args.conflict_policy,
+    )
+    print(report)
+
+
+if __name__ == "__main__":
+    main()