feat: Initialize project structure

Sets up the basic project configuration for Cognitive Clarity. This includes:
- Initializing `package.json` with necessary dependencies (React, Gemini API, Lucide React) and build scripts for Vite.
- Creating a basic `index.html` with Tailwind CSS and Google Fonts integration.
- Setting up `index.tsx` as the React application entry point.
- Configuring `tsconfig.json` for TypeScript compilation with Vite.
- Establishing `vite.config.ts` for development server setup and environment variable handling.
- Adding a standard `.gitignore` file.
- Updating `README.md` with local run instructions and AI Studio links.
- Defining `metadata.json` for application details.
- Creating core type definitions in `types.ts`.
- Populating `constants.ts` with initial CBT glossary terms.
- Adding utility functions for audio processing in `services/audioUtils.ts`.

.gitignore

@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?