Rebrand to Obsidian with modern UI and auto-refresh

- Renamed project from "Test Artifact Data Lake" to "Obsidian"
- Updated all branding across README, quickstart scripts, and API
- Implemented dark mode theme with professional color palette
- Simplified table to 4 essential columns (Sim Source, Artifacts, Date, Uploaded By)
- Replaced emoji icons with Lucide SVG icons for better scaling
- Added auto-refresh functionality (5-second intervals, toggleable)
- Enhanced UI with modern flexbox layouts and hover effects
- Updated upload form labels to match new terminology

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

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

app/main.py

@@ -19,8 +19,8 @@ logger = logging.getLogger(__name__)
 
 # Create FastAPI app
 app = FastAPI(
-    title="Test Artifact Data Lake",
-    description="API for storing and querying test artifacts including CSV, JSON, binary files, and packet captures",
+    title="Obsidian",
+    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",
     redoc_url="/redoc"
@@ -59,7 +59,7 @@ async def startup_event():
 async def api_root():
     """API root endpoint"""
     return {
-        "message": "Test Artifact Data Lake API",
+        "message": "Obsidian - 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": "Test Artifact Data Lake API",
+            "message": "Obsidian - Enterprise Test Artifact Storage",
             "version": "1.0.0",
             "docs": "/docs",
             "ui": "UI not found. Serving API only.",