Add gitignore and environment example

Co-authored-by: Cursor <cursoragent@cursor.com>

.env.example

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+MONGODB_URI=mongodb://localhost:27017/eventbuzz
+# Local: redis://127.0.0.1:6379
+# DigitalOcean Managed Redis (port 25061) — TLS required; auto-enabled for *.ondigitalocean.com hosts
+# REDIS_URL=rediss://default:password@host:25061
+# Or: REDIS_URL=redis://... & REDIS_TLS=true
+REDIS_URL=redis://127.0.0.1:6379
+CONCIERGE_QUEUE_PREFIX=eventbuzz:concierge:
+
+PORT=3020
+HOST=localhost
+
+META_WHATSAPP_WEBHOOK_VERIFY_TOKEN=
+
+# Same AWS / Bedrock / Meta vars as backend/.env
+AWS_ACCESS_KEY_ID=
+AWS_SECRET_ACCESS_KEY=
+AWS_DEFAULT_REGION=ap-south-1
+AWS_BUCKET=
+BEDROCK_MODEL_ID=meta.llama3-8b-instruct-v1:0
+BEDROCK_EMBED_MODEL_ID=amazon.titan-embed-text-v2:0
+META_WHATSAPP_ACCESS_TOKEN=
+META_WHATSAPP_DEFAULT_WABA_ID=
+META_WHATSAPP_DEFAULT_PHONE_NUMBER_ID=

.gitignore

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+node_modules/
+dist/
+.DS_Store
+*.local
+
+# Env (keep .env.example)
+.env
+.env.*
+!.env.example