feat: Step 1 - Project setup & smoke test

Initialize Next.js 16 (App Router) project with all core dependencies:
- Next.js, React 19, TypeScript configuration
- Mantine UI components (@mantine/core, @mantine/hooks)
- ATproto SDK for Bluesky integration
- SurrealDB client (updated to latest non-deprecated version)
- Vercel AI SDK with Google AI provider
- Deepgram SDK for voice-to-text
- React Three Fiber for 3D visualization
- UMAP.js for dimensionality reduction
- Magnitude test framework for E2E testing
- Playwright for browser automation

Created basic app structure with homepage displaying "Ponderants" text.
Configured magnitude.config.ts for testing framework.
Added .example.env with all required environment variables.

Test: Smoke test verifies app boots and renders homepage.
Status: ✓ Test passed (8.4s)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.example.env

@@ -0,0 +1,22 @@
+# SurrealDB Configuration
+SURREALDB_URL=ws://localhost:8000/rpc
+SURREALDB_NS=ponderants
+SURREALDB_DB=main
+SURREALDB_USER=root
+SURREALDB_PASS=root
+
+# JWT Secret for SurrealDB token minting
+JWT_SECRET=your-secret-key-here-change-in-production
+
+# Google AI API Key (for Gemini embeddings and chat)
+GOOGLE_AI_API_KEY=your-google-ai-api-key
+
+# Deepgram API Key (for voice-to-text)
+DEEPGRAM_API_KEY=your-deepgram-api-key
+
+# ATproto OAuth Configuration
+ATPROTO_CLIENT_ID=http://localhost:3000/client-metadata.json
+ATPROTO_REDIRECT_URI=http://localhost:3000/api/auth/callback
+
+# Anthropic API Key (for Magnitude testing)
+ANTHROPIC_API_KEY=your-anthropic-api-key