Remove project-url-shortener/db in favor of OpenChoreo's postgres CRT

[adibmbrk]

Summary

• OpenChoreo's url-shortener samples (both from-image and from-source) now provision Postgres as a Resource off the shipped postgres ClusterResourceType, using its initSQL parameter to seed the urls/clicks schema, instead of building this repo's custom Postgres image.
• Removes project-url-shortener/db entirely (Dockerfile, init.sql, workload.yaml) — no longer referenced by any OpenChoreo sample.
• docker-compose.yaml's postgres service now runs a stock postgres:15-alpine image instead of build: ./db.

Breaking change for local dev

Removing init.sql means docker compose up no longer auto-creates the urls/clicks schema. Anyone running this locally will need to apply the schema manually (e.g. psql against the compose Postgres) until/unless the services themselves run migrations on startup.

Test plan

• docker compose up --build in project-url-shortener brings up Postgres (schema now needs to be applied manually — see above)

[coderabbitai]

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