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/builder_conversation/__init__.py

@@ -0,0 +1,79 @@
+"""Focused Builder conversation policy for lightweight resume completion.
+
+Builder collects confirmed resume facts only. It never calls the deep-optimization
+graph, job rubrics, Office data, or JD analysis. Candidate rewrites remain optional
+until the user explicitly chooses one in the confirmation card.
+
+This package was split from the original single module to keep every code file
+within the 200-line harness limit. The public surface is re-exported here so
+existing `from . import builder_conversation` / `from app.builder_conversation
+import ...` consumers keep working unchanged.
+"""
+
+from __future__ import annotations
+
+from .candidate import (
+    _candidate_rewrite,
+    _fact_is_preserved,
+    _material_fact_fragments,
+    _normalize_material_fact,
+    _uncovered_material_facts,
+)
+from .component_events import process_component_event
+from .constants import (
+    GAP_PROMPTS,
+    IDENTITY_CHANGE_TERMS,
+    MAX_GAP_DIMENSIONS,
+    MAX_GAPS_PER_TURN,
+    NO_INFORMATION_PATTERNS,
+    SECTION_GAP_DIMENSIONS,
+    SECTION_HEADINGS,
+    SECTION_KEYWORDS,
+    SECTION_PRIORITY,
+    u,
+)
+from .flow import _begin_edit, _process_detail_message, process_message
+from .followups import (
+    _continue_recent_entry,
+    _redisplay_revision_candidate,
+    reconcile_last_confirmed_entry,
+)
+from .predicates import (
+    _dimension_present,
+    _entry_by_id,
+    _gap_prompt,
+    _is_no_information_reply,
+    _is_revision_instruction,
+    _looks_like_recent_continuation,
+    _matching_entries,
+    _next_gap_dimensions,
+    _requested_section,
+    _requests_identity_change,
+    _requests_new_entry,
+)
+from .save import save_entry
+from .skills import _builder_skill_candidates, _process_skill_selection, _skill_choice_card
+from .state import (
+    _clear_draft,
+    _completed_sections,
+    _dedupe_strings,
+    _gap_state,
+    _highlights,
+    _merge_fact_text,
+    _public_entry,
+    _reset_gap_state,
+    _set_stream_phases,
+    ensure_builder_state,
+)
+from .turns import (
+    _entry_choice_card,
+    _entry_label,
+    _fact_prompt,
+    _next_step_turn,
+    _record_card,
+    _section_choice_card,
+    recommended_section,
+    welcome_turn,
+)
+
+__all__ = [name for name in dir() if not name.startswith("__")]