chore: update .env.example files for RS256 + Redis

- Root .env.example: replace JWT_SECRET/JWT_ALGORITHM with JWT_PUBLIC_KEY, add REDIS_URL
- Auth Service .env.example: JWT_PRIVATE_KEY + JWT_PUBLIC_KEY with generation instructions

.env.example

@@ -4,9 +4,17 @@ ENV=dev
 # ── Database ──────────────────────────────────────────────────────────────────
 DATABASE_URL=postgresql+asyncpg://postgres:postgres@localhost:5432/adiuva
 
-# ── Auth ──────────────────────────────────────────────────────────────────────
-JWT_SECRET=replace-with-a-long-random-secret
-JWT_ALGORITHM=HS256
+# ── Redis ─────────────────────────────────────────────────────────────────────
+REDIS_URL=redis://localhost:6379/0
+
+# ── Auth (JWT RS256) ──────────────────────────────────────────────────────────
+# Public key for optional local JWT verification (Traefik ForwardAuth handles
+# this in production — services trust X-User-* headers from Traefik).
+# Generate keypair:
+#   openssl genpkey -algorithm RSA -out private.pem -pkeyopt rsa_keygen_bits:2048
+#   openssl rsa -in private.pem -pubout -out public.pem
+# Paste PEM content with literal \n for newlines.
+JWT_PUBLIC_KEY=
 JWT_ACCESS_TOKEN_EXPIRE_MINUTES=30
 JWT_REFRESH_TOKEN_EXPIRE_DAYS=30
 

services/auth/.env.example

@@ -0,0 +1,19 @@
+# ── Auth Service ──────────────────────────────────────────────────────────────
+# This file contains env vars specific to the Auth Service.
+# Shared vars (DATABASE_URL, REDIS_URL, etc.) come from the root .env
+# or from docker-compose environment.
+
+# ── JWT RS256 Keys ────────────────────────────────────────────────────────────
+# Generate keypair:
+#   openssl genpkey -algorithm RSA -out private.pem -pkeyopt rsa_keygen_bits:2048
+#   openssl rsa -in private.pem -pubout -out public.pem
+#
+# Paste PEM content with literal \n for newlines:
+#   JWT_PRIVATE_KEY=-----BEGIN PRIVATE KEY-----\nMIIEvQ...
+#   JWT_PUBLIC_KEY=-----BEGIN PUBLIC KEY-----\nMIIBIj...
+
+# PRIVATE KEY — used to SIGN JWTs. NEVER share outside this service.
+JWT_PRIVATE_KEY=
+
+# PUBLIC KEY — used to VERIFY JWTs.
+JWT_PUBLIC_KEY=