chore(prep): shared groundwork for batch-4 (report pipeline)

第四批（T15 编排/T16 视觉诊断/T17 文案校验）协调提交：
- 迁移 0006：rp_report（result JSONB 按阶段键承载中间态）/rp_input
 （derived_features 视觉中间态）/rp_share（V1 只建结构）
- ORM 三模型；错误码 40420/40920（文案无价格字样）
- 配置：report_pipeline_stages（dotted path 动态装配）+ vision/tier
- packages/report/pipeline.py：Stage Protocol + ReportContext（三任务共同契约，
  动态 import 的动机与代价写在 docstring）
- 路由桩 reports.py 已注册

packages/shared/models.py

@@ -479,3 +479,65 @@ class KbGap(Base):
     )
 
     __table_args__ = (Index("ix_kb_gap_query", "query_text"),)
+
+
+# ---------------------------------------------------------------------------
+# report 域（美学报告，架构文档 §6.2 / §7.1）
+# ---------------------------------------------------------------------------
+class RpReport(Base):
+    """报告主表。result JSONB 同时承载流水线中间态与最终产物（按 stage 键）——
+    阶段逐段落库是 T-P3-09「失败不需重新上传」的结构基础。"""
+
+    __tablename__ = "rp_report"
+
+    report_id: Mapped[int] = mapped_column(BigInteger, primary_key=True, autoincrement=False)
+    user_id: Mapped[int] = mapped_column(BigInteger, nullable=False)
+    tier: Mapped[str] = mapped_column(String(8), nullable=False, default="basic")
+    status: Mapped[str] = mapped_column(String(16), nullable=False, default="pending")
+    version: Mapped[int] = mapped_column(Integer, nullable=False, default=1)
+    result: Mapped[dict[str, Any]] = mapped_column(JSONB, nullable=False, default=dict)
+    model_info: Mapped[dict[str, Any]] = mapped_column(JSONB, nullable=False, default=dict)
+    content_code: Mapped[str | None] = mapped_column(String(32))
+    rendered_asset_key: Mapped[str | None] = mapped_column(String(255))
+    cost_cents: Mapped[Decimal] = mapped_column(
+        Numeric(14, 6), nullable=False, default=Decimal("0")
+    )
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, server_default=func.now()
+    )
+    completed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+
+    __table_args__ = (Index("ix_rp_report_user_created", "user_id", "created_at"),)
+
+
+class RpInput(Base):
+    """报告输入。derived_features 是视觉分析的中间态：重试/重新生成时
+    已存在则跳过视觉阶段（T-P3-09）。只存派生特征与元信息，不存原图（CR-02）。"""
+
+    __tablename__ = "rp_input"
+
+    input_id: Mapped[int] = mapped_column(BigInteger, primary_key=True, autoincrement=False)
+    report_id: Mapped[int] = mapped_column(BigInteger, nullable=False)
+    questionnaire: Mapped[dict[str, Any]] = mapped_column(JSONB, nullable=False, default=dict)
+    photo_meta: Mapped[dict[str, Any]] = mapped_column(JSONB, nullable=False, default=dict)
+    derived_features: Mapped[dict[str, Any]] = mapped_column(JSONB, nullable=False, default=dict)
+
+    __table_args__ = (UniqueConstraint("report_id", name="uq_rp_input_report"),)
+
+
+class RpShare(Base):
+    """分享链接：可失效、可撤回（V1 只建结构，路由后续任务）。"""
+
+    __tablename__ = "rp_share"
+
+    share_id: Mapped[int] = mapped_column(BigInteger, primary_key=True, autoincrement=False)
+    report_id: Mapped[int] = mapped_column(BigInteger, nullable=False)
+    share_token: Mapped[str] = mapped_column(String(64), nullable=False)
+    expire_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
+    view_count: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
+    revoked: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, server_default=func.now()
+    )
+
+    __table_args__ = (UniqueConstraint("share_token", name="uq_rp_share_token"),)