chore: update dependencies and refactor code structure

- Updated package dependencies in package.json and package-lock.json to ensure compatibility and security.
- Changed the development script to use 'tsx' instead of 'ts-node' for improved performance.
- Refactored the Mastra initialization in src/mastra/index.ts to remove the weatherAgent and streamline the agent setup.
- Deleted the unused src/mastra/agents/index.ts file to clean up the codebase.
- Removed the obsolete tsconfig.json file from src/mastra for better organization.
- Added a new .vscode/settings.json file to configure spell checking for the project.
- Adjusted TypeScript configuration in tsconfig.json to target ES2022 and use NodeNext module resolution.

Author: JC-Coder

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+  "cSpell.words": ["Mastra"]
+}