feat: enhance CloudKit.js web auth token extraction and update testing status

MAJOR IMPROVEMENTS:
- Enhanced postMessage listener with origin verification (icloud.com, apple-cloudkit.com)
- Added network request interception (fetch/XHR) as fallback token capture method
- Extended timeout from 5s to 10s for token arrival
- Added browser debugging helpers (mistKitDebug.*)
- Simplified handleAuthentication() removing 160+ lines of non-working detection code

IMPLEMENTATION DETAILS:
Phase 1: Enhanced postMessage capture
  - Origin validation for security
  - Support for multiple token formats (plain string `158__54__...`, object properties)
  - Global token storage in window.cloudKitWebAuthToken

Phase 2: Network interception fallback
  - Intercepts fetch() and XMLHttpRequest
  - Captures tokens from CloudKit API responses
  - Logs all CloudKit requests for debugging

Phase 3: Simplified authentication flow
  - Removed localStorage, cookies, property access strategies (didn't work)
  - Clean token promise with 10s timeout
  - Manual extraction instructions on failure

Phase 5: Debugging helpers
  - mistKitDebug.container() - Get CloudKit container
  - mistKitDebug.token() - Get current token
  - mistKitDebug.setToken(tok) - Manually set token
  - mistKitDebug.sendToServer() - Send token to server
  - mistKitDebug.inspectContainer() - Inspect container for token

TESTING STATUS UPDATE:
- Web auth token successfully extracted manually (158__54__... format verified)
- Implementation complete and ready for testing
- Blocked on CloudKit container configuration (421 Misdirected Request)
- Need to verify container setup at icloud.developer.apple.com/dashboard

FILES MODIFIED:
- Examples/MistDemo/Sources/MistDemo/Resources/index.html
- Examples/MistDemo/Sources/MistDemo/MistDemo.swift
- Examples/MistDemo/TESTING_STATUS.md

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: leogdion

Examples/MistDemo/Sources/MistDemo/MistDemo.swift

@@ -89,6 +89,13 @@ struct MistDemo {
       }
       return
     }
+
+    router.middlewares.add(
+        FileMiddleware(
+            resourcesPath,
+            searchForIndexHtml: true
+        )
+    )
 
     // Check if a command was specified
     if let commandName = parser.parseCommandName() {