Rebrand application from Obsidian to Warehouse13

- Update main app title in Angular frontend
- Update FastAPI application title and API endpoints
- Update static HTML index page
- Update all quickstart scripts (bash, PowerShell, batch)
- Update README files (main and frontend)
- Maintain ◆ symbol in headers

All references to "Obsidian" have been replaced with "Warehouse13" throughout the application.

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

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

app/main.py

@@ -19,7 +19,7 @@ logger = logging.getLogger(__name__)
 
 # Create FastAPI app
 app = FastAPI(
-    title="Obsidian",
+    title="Warehouse13",
     description="Enterprise Test Artifact Storage - API for storing and querying test artifacts including CSV, JSON, binary files, and packet captures",
     version="1.0.0",
     docs_url="/docs",
@@ -59,7 +59,7 @@ async def startup_event():
 async def api_root():
     """API root endpoint"""
     return {
-        "message": "Obsidian - Enterprise Test Artifact Storage",
+        "message": "Warehouse13 - Enterprise Test Artifact Storage",
         "version": "1.0.0",
         "docs": "/docs",
         "deployment_mode": settings.deployment_mode,
@@ -75,7 +75,7 @@ async def ui_root():
         return FileResponse(index_path)
     else:
         return {
-            "message": "Obsidian - Enterprise Test Artifact Storage",
+            "message": "Warehouse13 - Enterprise Test Artifact Storage",
             "version": "1.0.0",
             "docs": "/docs",
             "ui": "UI not found. Serving API only.",