docs: add .env.example with required environment variables

Lists all Neon, Redis, and Groq variables needed for the app.
Values are auto-populated on Vercel via integrations.

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

Co-Authored-By: Claude <[email protected]>

Author: Krigs

odin-framework/apps/web/.env.example

@@ -0,0 +1,29 @@
+# ===========================================
+# ODIN Framework - Environment Variables
+# ===========================================
+# Copy this file to .env.local and fill in your values
+# These are automatically set on Vercel via integrations
+
+# ----- PostgreSQL (Neon) -----
+DATABASE_URL=
+POSTGRES_URL=
+POSTGRES_PRISMA_URL=
+POSTGRES_URL_NO_SSL=
+POSTGRES_URL_NON_POOLING=
+DATABASE_URL_UNPOOLED=
+POSTGRES_HOST=
+PGHOST=
+PGHOST_UNPOOLED=
+POSTGRES_USER=
+PGUSER=
+POSTGRES_PASSWORD=
+PGPASSWORD=
+POSTGRES_DATABASE=
+PGDATABASE=
+NEON_PROJECT_ID=
+
+# ----- Redis -----
+REDIS_URL=
+
+# ----- LLM Providers -----
+GROQ_API_KEY=

odin-framework/apps/web/.gitignore

@@ -25,8 +25,9 @@ npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
 
-# env files (can opt-in for commiting if needed)
+# env files
 .env*
+!.env.example
 
 # vercel
 .vercel