fix: correct manifest.json to pass MCPB validation

- Add required 'version' field (1.0.0)
- Change 'author' from string to object with name/url
- Move 'mcp_config' inside 'server' object
- Fix 'user_config' to use proper field-level structure
- Remove invalid 'compatibility' and 'capabilities' top-level fields
- Create bundle icon (512x512 PNG) to satisfy icon requirement
- Remove icon placeholder file

Validation: ✅ mcpb validate passes with warnings only
Tasks: T149 (icon), T158 (validate), T159 (build) marked complete

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

package.json

@@ -6,6 +6,7 @@
   "main": "dist/index.js",
   "scripts": {
     "build": "tsc",
+    "validate-manifest": "mcpb validate manifest.json",
     "pack": "npm run build && mcpb pack",
     "test": "jest",
     "dev": "tsc --watch",
@@ -28,6 +29,7 @@
     "zod": "^3.22.4"
   },
   "devDependencies": {
+    "@anthropic-ai/mcpb": "^2.1.2",
     "@types/jest": "^29.5.11",
     "@types/node": "^20.10.6",
     "jest": "^29.7.0",