Initial project scaffold: Open Brain self-hosted knowledge infrastructure

Node.js/TypeScript server with MCP endpoint for AI assistant integration,
Discord bot for thought capture and slash commands, PostgreSQL + pgvector
for semantic search, and OpenRouter for embeddings/metadata extraction.
Dockerized for deployment behind Caddy.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,15 @@
+# Database (host.docker.internal = host machine from inside Docker)
+DATABASE_URL=postgresql://brain_user:password@host.docker.internal:5432/brain
+
+# OpenRouter (AI gateway for embeddings + metadata extraction)
+OPENROUTER_API_KEY=sk-or-...
+
+# Discord bot
+DISCORD_BOT_TOKEN=
+DISCORD_CAPTURE_CHANNEL_ID=
+
+# MCP endpoint authentication (generate with: openssl rand -hex 32)
+MCP_ACCESS_KEY=
+
+# Server port
+PORT=3100