chore(deps): update go dependencies (non-major) (#40)

* chore(deps): update go dependencies (non-major)

* fix: regenerate code and add postUpgradeTasks for Renovate

Regenerate templ and sqlc output to match bumped tool versions.
Configure Renovate postUpgradeTasks to run 'go generate ./...' after
Go dependency updates, preventing stale generated files in future PRs.

---------

Co-authored-by: onion-4-dinner <15676555+onion-4-dinner@users.noreply.github.com>

backend/database/sql/sqlcgen/playlists.sql.go

@@ -1,6 +1,6 @@
 // Code generated by sqlc. DO NOT EDIT.
 // versions:
-//   sqlc v1.29.0
+//   sqlc v1.30.0
 // source: playlists.sql
 
 package sqlcgen