refactor: extract token validation into reusable method

- Add validateProviderToken() helper method to reduce code duplication
- Use request body only ($request->json()->all()) to avoid route parameter conflicts
- Add proper logging for token validation failures
- Add missing DB import to migration file
- Minor test formatting fix

🤖 Generated with Claude Code

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

tests/Feature/CloudProviderTokenApiTest.php

@@ -15,7 +15,7 @@ beforeEach(function () {
     $this->team->members()->attach($this->user->id, ['role' => 'owner']);
 
     // Create an API token for the user
-    $this->token = $this->user->createToken('test-token', ['*'], $this->team->id);
+    $this->token = $this->user->createToken('test-token', ['*']);
     $this->bearerToken = $this->token->plainTextToken;
 });