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/resume_document.py

@@ -0,0 +1,62 @@
+"""Public pure-function API for resume document v3 operations."""
+
+from .resume_document_core import (
+    DocumentError,
+    entry_fingerprint,
+    gap_report_is_stale,
+    find_bullet,
+    find_entry,
+    find_section,
+    merge_ids,
+    merge_profile_refresh,
+    normalize_document,
+)
+from .resume_document_mutations import (
+    apply_delete_bullet,
+    apply_delete_entry,
+    apply_update_basics,
+    apply_update_bullet,
+    apply_update_entry,
+    apply_update_skill_groups,
+    apply_update_profile_summary,
+    confirm_profile_summary_proposal,
+    mark_profile_summary_stale,
+    reject_profile_summary_proposal,
+    set_generated_profile_summary,
+    set_profile_summary_proposal,
+    confirm_proposal,
+    reject_proposal,
+    set_pending_proposal,
+    set_entry_gap_report,
+    undo_entry,
+)
+
+__all__ = [
+    "DocumentError",
+    "apply_delete_bullet",
+    "apply_delete_entry",
+    "apply_update_basics",
+    "apply_update_bullet",
+    "apply_update_entry",
+    "apply_update_skill_groups",
+    "apply_update_profile_summary",
+    "confirm_profile_summary_proposal",
+    "mark_profile_summary_stale",
+    "reject_profile_summary_proposal",
+    "set_generated_profile_summary",
+    "set_profile_summary_proposal",
+    "confirm_proposal",
+    "entry_fingerprint",
+    "gap_report_is_stale",
+    "find_bullet",
+    "find_entry",
+    "find_section",
+    "merge_ids",
+    "merge_profile_refresh",
+    "normalize_document",
+    "reject_proposal",
+    "set_pending_proposal",
+    "set_entry_gap_report",
+    "undo_entry",
+]
+