Import source: app/backend/.env.example

Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.

app/backend/.env.example

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+# Backend env — copy to backend/.env and fill in for local dev.
+# Production secrets live in /etc/teknav/secrets.env on the Debian host (NOT in git).
+
+DATABASE_URL="postgresql://teknav:teknav_dev@localhost:5432/teknav?schema=public"
+REDIS_URL="redis://localhost:6379"
+
+# 32+ random bytes; required even in dev. Generate: `openssl rand -base64 48`
+SESSION_SECRET="CHANGE_ME_RANDOM_BYTES_AT_LEAST_32_CHARS"
+
+# Cookie scope. Leave empty in dev; in prod set to your apex domain (e.g. ".teknav.ir").
+COOKIE_DOMAIN=""
+
+# Where uploaded images go.
+UPLOAD_DIR="./uploads"
+
+# Comma-separated origins allowed by CORS. Use http://localhost:3009 for the Vite dev server.
+CORS_ORIGINS="http://localhost:3009"
+
+# Server port (Fastify). Frontend talks to /api/* via the reverse proxy in prod.
+PORT=3010
+
+# Pino log level: trace | debug | info | warn | error | fatal
+LOG_LEVEL=info
+
+# ── OAuth ────────────────────────────────────────────────────────────────────
+# Base URL for OAuth callback redirect URIs. In dev: http://localhost:3009
+OAUTH_CALLBACK_BASE=http://localhost:3009
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=
+GITHUB_CLIENT_ID=
+GITHUB_CLIENT_SECRET=
+
+# ── Email / SMS ──────────────────────────────────────────────────────────────
+# In development, blank SMTP logs mail instead of sending it.
+SMTP_HOST=
+SMTP_PORT=587
+SMTP_USER=
+SMTP_PASS=
+SMTP_FROM=no-reply@teknav.ir
+
+# Email to receive daily client error digest (leave empty to disable)
+ADMIN_ALERT_EMAIL=
+
+SMS_PROVIDER=
+SMS_API_KEY=
+SMS_SENDER=
+
+# ── Web Push ─────────────────────────────────────────────────────────────────
+# Blank values make push delivery a no-op.
+VAPID_PUBLIC_KEY=
+VAPID_PRIVATE_KEY=
+VAPID_SUBJECT=mailto:admin@teknav.ir
+
+# ── Monetization ─────────────────────────────────────────────────────────────
+# Blank merchant id makes membership subscription return payment_unavailable.
+ZARINPAL_MERCHANT_ID=
+ZARINPAL_SANDBOX=1
+MEMBERSHIP_PRICE_IRR=5000000
+MEMBERSHIP_DURATION_DAYS=365
+
+# ── Storage ──────────────────────────────────────────────────────────────────
+# Local disk is the active implementation.
+STORAGE_BACKEND=local
+S3_ENDPOINT=
+S3_BUCKET=
+S3_ACCESS_KEY=
+S3_SECRET_KEY=