Implement all core features: Knowledge pipeline, RAG chat, Todos, Habits, Study Cards, Tags, Dashboard

- Google OAuth authentication with callback flow
- Knowledge ingest pipeline (TEXT/WEB/YOUTUBE → chunking → categorization → embedding)
- OCI GenAI integration (chat, embeddings) with multi-model support
- Semantic search via Oracle VECTOR_DISTANCE
- RAG-based AI chat with source attribution
- Todos with subtasks, filters, and priority levels
- Habits with daily check-in, streak tracking, and color customization
- Study Cards with SM-2 spaced repetition and LLM auto-generation
- Tags system with knowledge item mapping
- Dashboard with live data from all modules

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ecosystem.config.cjs

@@ -17,6 +17,8 @@ module.exports = {
       env: {
         PORT: 3000,
         HOSTNAME: "0.0.0.0",
+        NEXT_PUBLIC_API_URL: "https://sundol.cloud-handson.com",
+        NEXT_PUBLIC_GOOGLE_CLIENT_ID: "906390686133-vpqsisodkg6uqui469hg8dhupbejoa0d.apps.googleusercontent.com",
       },
     },
   ],