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/tests/test_optimization_tiers.py

@@ -0,0 +1,49 @@
+"""Tests for membership-tier pipeline parameterization."""
+
+from app.optimization_tiers import tier_config_for_session
+
+
+def test_default_session_uses_free_tier(monkeypatch) -> None:
+    monkeypatch.delenv("RESUME_AGENT_DEFAULT_TIER", raising=False)
+    config = tier_config_for_session({"profile": {}})
+
+    assert config.tier == "free"
+    assert config.deep_allowed is False
+    assert config.include_gap_report is True
+    assert config.max_questions == 0
+
+
+def test_vip_tier_enables_deep_interview_with_complete_preset() -> None:
+    config = tier_config_for_session({"profile": {"entitlement_tier": "VIP"}})
+
+    assert config.tier == "vip"
+    assert config.deep_allowed is True
+    assert config.max_questions == 6
+    assert config.min_questions == 2
+    assert config.gap_threshold == 8.0
+
+
+def test_unknown_tier_falls_back_to_free() -> None:
+    config = tier_config_for_session({"profile": {"entitlement_tier": "enterprise_x"}})
+
+    assert config.tier == "free"
+    assert config.deep_allowed is False
+
+
+def test_unentitled_session_uses_local_vip_default(monkeypatch) -> None:
+    monkeypatch.setenv("RESUME_AGENT_DEFAULT_TIER", "vip")
+
+    config = tier_config_for_session({"profile": {}})
+
+    assert config.tier == "vip"
+    assert config.deep_allowed is True
+    assert config.gap_threshold == 8.0
+
+
+def test_explicit_free_entitlement_overrides_local_vip_default(monkeypatch) -> None:
+    monkeypatch.setenv("RESUME_AGENT_DEFAULT_TIER", "vip")
+
+    config = tier_config_for_session({"profile": {"entitlement_tier": "free"}})
+
+    assert config.tier == "free"
+    assert config.deep_allowed is False