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/app/experience_optimizer_models.py

@@ -0,0 +1,39 @@
+"""Structured contracts for experience optimization model output."""
+
+from __future__ import annotations
+
+from typing import Literal
+
+from pydantic import Field
+
+from .llm_services import StrictSchema
+
+
+class StarOutput(StrictSchema):
+    situation: str | None
+    task: str | None
+    action: str | None
+    result: str | None
+
+
+class ClaimOutput(StrictSchema):
+    text: str
+    evidence_ids: list[str] = Field(max_length=12)
+    claim_type: Literal[
+        "action", "result", "metric", "technology", "role",
+        "organization", "award", "time",
+    ]
+
+
+class ExperienceOptimizationOutput(StrictSchema):
+    optimized_description: str = Field(min_length=1, max_length=1200)
+    bullets: list[str] = Field(min_length=1, max_length=5)
+    star: StarOutput
+    changes: list[str] = Field(max_length=5)
+    missing_facts: list[str] = Field(max_length=8)
+    claims: list[ClaimOutput] = Field(max_length=12)
+    covered_fact_ids: list[str] = Field(default_factory=list, max_length=24)
+    omitted_fact_ids: list[str] = Field(default_factory=list, max_length=24)␍
+    unconfirmed_suggestions: list[str] = Field(default_factory=list, max_length=6)
+    optional_enhancements: list[str] = Field(default_factory=list, max_length=6)
+