feat: add language column, AI Generated category, and mine/shared filters

- Add language column (powershell/bash/python) to script_templates model and schemas
- Seed 'AI Generated' script category via migration 063
- Add mine and shared query params to list_templates endpoint

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/api/endpoints/scripts.py

@@ -76,6 +76,8 @@ async def list_templates(
     search: Optional[str] = Query(None),
     tags: Optional[str] = Query(None, description="Comma-separated tags"),
     managed: Optional[bool] = Query(None, description="If true, return only templates this user can edit"),
+    mine: bool = Query(False, description="If true, return only templates created by the current user"),
+    shared: bool = Query(False, description="If true, return only templates shared with the user's team"),
 ) -> list[ScriptTemplateListItem]:
     query = (
         select(ScriptTemplate)
@@ -116,6 +118,12 @@ async def list_templates(
             # engineers see only their own
             query = query.where(ScriptTemplate.created_by == current_user.id)
 
+    if mine:
+        query = query.where(ScriptTemplate.created_by == current_user.id)
+
+    if shared:
+        query = query.where(ScriptTemplate.team_id == current_user.team_id)
+
     result = await db.execute(query.order_by(ScriptTemplate.name))
     templates = result.scalars().all()