feat: added global search, ai assitant demo, refactoring

[ducheharsh]

This pull request introduces several new features and updates across the backend and frontend applications. Key changes include adding Redis integration for caching and embedding-based searches, implementing new AI-driven functionalities like playful text generation, and enhancing the frontend user experience with visual improvements and new components.

Backend Changes

Redis Integration and Search Enhancements:

• Added Redis client creation utilities in apps/backend/src/lib/redis.ts for caching and embedding-based searches.
• Implemented globalSearchController in apps/backend/src/controllers/dev.controller.ts to perform embedding-based similarity searches and cache results using Redis.

AI Features:

• Added octacat method to AIController in apps/backend/src/controllers/ai.controller.ts to generate playful text based on user context and journal entries.
• Added octacat method to AIService in apps/backend/src/services/ai.services.ts to handle text generation logic.

Routing Updates:

• Added /search and /octacat routes to apps/backend/src/routes/dev.route.ts and apps/backend/src/routes/ai.route.ts respectively for new functionalities. [1] [2]

Frontend Changes

UI Enhancements:

• Replaced plain loading states with TextShimmerWave for a visually appealing loading experience in apps/frontend/src/app/journal/[id]/page.tsx. (apps/frontend/src/app/journal/[id]/page.tsxL63-R66, apps/frontend/src/app/journal/[id]/page.tsxL78-R81, apps/frontend/src/app/journal/[id]/page.tsxL98-R101)

New Components:

• Added Octacat component to the dashboard in apps/frontend/src/app/dashboard/page.tsx to display AI-generated playful text. [1] [2]

Dependency Updates:

• Added several new dependencies, including @upstash/redis, cmdk, and fuse.js, in apps/backend/package.json and apps/frontend/package.json for enhanced functionality. [1] [2]