Integrate dark theme styling from main branch with Angular Material

- Apply dark blue color scheme (#0f172a, #1e293b, #334155) throughout UI
- Update header with blue gradient and Obsidian branding
- Add missing toolbar buttons: Auto-refresh, Seed Data, Search filter
- Implement action buttons (Download, Delete) in artifacts table
- Add client-side search/filtering functionality
- Update app to support sim_source_id field in database
- Move quickstart scripts to repository root for easier access
- Apply dark theme to tables, tabs, and all Material components

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/schemas/artifact.py

@@ -8,6 +8,7 @@ class ArtifactCreate(BaseModel):
     test_suite: Optional[str] = None
     test_config: Optional[Dict[str, Any]] = None
     test_result: Optional[str] = None
+    sim_source_id: Optional[str] = None
     custom_metadata: Optional[Dict[str, Any]] = None
     description: Optional[str] = None
     tags: Optional[List[str]] = None
@@ -26,6 +27,7 @@ class ArtifactResponse(BaseModel):
     test_suite: Optional[str] = None
     test_config: Optional[Dict[str, Any]] = None
     test_result: Optional[str] = None
+    sim_source_id: Optional[str] = None
     custom_metadata: Optional[Dict[str, Any]] = None
     description: Optional[str] = None
     tags: Optional[List[str]] = None
@@ -44,6 +46,7 @@ class ArtifactQuery(BaseModel):
     test_name: Optional[str] = None
     test_suite: Optional[str] = None
     test_result: Optional[str] = None
+    sim_source_id: Optional[str] = None
     tags: Optional[List[str]] = None
     start_date: Optional[datetime] = None
     end_date: Optional[datetime] = None