Refactor LOVE.NET into event-driven microservices

.env.example

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+# Copy to .env and fill in the secrets. .env is gitignored.
+
+# Postgres superuser password shared by the per-service database containers.
+POSTGRES_PASSWORD=lovenet
+
+# HS512 signing key shared by all services (Identity signs, everyone validates).
+# Use a long random string (64+ chars).
+JWT_KEY=REPLACE_WITH_A_LONG_RANDOM_SECRET_OF_AT_LEAST_64_CHARACTERS________
+JWT_ISSUER=https://localhost:3000/
+JWT_AUDIENCE=https://localhost:3000/
+
+# Cloudinary (image storage) — same account the monolith used.
+CLOUDINARY_CLOUD_NAME=
+CLOUDINARY_KEY=
+CLOUDINARY_SECRET=
+
+# SendGrid (transactional email).
+SENDGRID_API_KEY=
+
+# SPA origin allowed by CORS.
+FRONTEND_ORIGIN=http://localhost:3000