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>

frontend/README.md

@@ -1,6 +1,6 @@
-# Obsidian Frontend - Angular Application
+# Warehouse13 Frontend - Angular Application
 
-Modern Angular application for the Obsidian Test Artifact Data Lake.
+Modern Angular application for the Warehouse13 Test Artifact Data Lake.
 
 ## Features
 

frontend/src/app/app.ts

@@ -11,7 +11,7 @@ import { ArtifactService } from './services/artifact';
   template: `
     <div class="container">
       <header>
-        <h1>◆ Obsidian</h1>
+        <h1>◆ Warehouse13</h1>
         <div class="header-info">
           <span class="badge">{{ deploymentMode }}</span>
           <span class="badge">{{ storageBackend }}</span>