feat(models): add org_id to Article, PublishRecord, ContentMetrics, SearchRanking, GeoReadinessScore

- Add org_id column to 5 models with default='default'
- Update to_dict() methods for ContentMetrics, SearchRanking, GeoReadinessScore
- Add ALTER TABLE migrations in database.py init_db()
- Add org_id to 6 Pydantic response schemas
- Add require_role() helper factory in auth.py

platform/backend/app/schemas.py

@@ -151,6 +151,7 @@ class ArticleBase(BaseModel):
     title: Optional[str] = None
     content: Optional[str] = None
     status: str = "draft"
+    org_id: Optional[str] = None
     compliance_score: Optional[int] = None
     word_count: Optional[int] = None
     outline: Optional[str] = None
@@ -193,6 +194,7 @@ class ContentCalendarUpdate(BaseModel):
 
 class ContentCalendarResponse(ContentCalendarBase):
     id: int
+    org_id: Optional[str] = None
     published_date: Optional[date] = None
     created_by: Optional[str] = None
     created_at: Optional[datetime] = None
@@ -230,6 +232,7 @@ class ContentMetricsUpdate(BaseModel):
 
 class ContentMetricsResponse(ContentMetricsBase):
     id: int
+    org_id: Optional[str] = None
     engagement_rate: float = 0
     last_fetched: Optional[datetime] = None
     created_at: Optional[datetime] = None
@@ -265,6 +268,7 @@ class MediaAssetUpdate(BaseModel):
 
 class MediaAssetResponse(MediaAssetBase):
     id: int
+    org_id: Optional[str] = None
     usage_count: int = 0
     uploaded_by: Optional[str] = None
     created_at: Optional[datetime] = None
@@ -340,6 +344,7 @@ class ContentTaskCreate(BaseModel):
 
 class ContentTaskResponse(ContentTaskBase):
     id: int
+    org_id: Optional[str] = None
     task_id: str
     topic_id: Optional[str] = None
     topic_title: Optional[str] = None
@@ -454,6 +459,7 @@ class PublishRecordResponse(BaseModel):
     platform: str
     action: str
     status: str
+    org_id: Optional[str] = None
     operator: Optional[str] = None
     description: Optional[str] = None
     suggestion: Optional[str] = None