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/alembic/env.py

@@ -0,0 +1,48 @@
+from __future__ import annotations
+
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+
+from app.db.schema import build_session_tables
+
+
+config = context.config
+schema = config.get_main_option("resume_agent.schema", "resume_agent")
+target_metadata, _ = build_session_tables(schema)
+
+
+def run_migrations_offline() -> None:
+    context.configure(
+        url=config.get_main_option("sqlalchemy.url"),
+        target_metadata=target_metadata,
+        include_schemas=True,
+        version_table_schema=schema,
+        literal_binds=True,
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+    with connectable.connect() as connection:
+        connection.exec_driver_sql(f'CREATE SCHEMA IF NOT EXISTS "{schema}"')
+        connection.commit()
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            include_schemas=True,
+            version_table_schema=schema,
+        )
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()