chore: standardize config, MCP, agents, and docs

- Add .headlamp-plugin/, .env, .env.local, .eslintcache to .gitignore
- Create .prettierrc.js (standard Headlamp prettier config)
- Fix .mcp.json typo (http:/ → http://), add github server, use localhost:8086 for playwright
- Add "github" to .claude/settings.local.json enabled servers
- Create .claude/agents/ with 3 meta-orchestration agents
- Add FilesystemsPage.tsx and ObjectStoresPage.tsx to CLAUDE.md architecture tree
- Add ArtifactHub badge, Plugin Manager install method, and Troubleshooting section to README.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.mcp.json

@@ -1,8 +1,15 @@
 {
   "mcpServers": {
+    "github": {
+      "type": "http",
+      "url": "https://api.githubcopilot.com/mcp/",
+      "headers": {
+        "Authorization": "Bearer ${GITHUB_TOKEN}"
+      }
+    },
     "kubernetes": {
       "type": "sse",
-      "url": "http:/localhost:8080/sse"
+      "url": "http://localhost:8080/sse"
     },
     "flux": {
       "type": "sse",
@@ -10,7 +17,7 @@
     },
     "playwright": {
       "type": "sse",
-      "url": "http://playwright-mcp.playwright.svc.cluster.local:3000/sse"
-    } 
+      "url": "http://localhost:8086/sse"
+    }
   }
-}
+}