Add sqlc configuration and core queries

sqlc.yaml (sqlite, schema migrations/, queries migrations/queries/)
generates internal/db with emit_interface. Queries cover dinners (create,
get, list by status, update, archive, set favorite), recipes with
ingredients and steps (upsert by source_url, get, replace children),
photos (insert, get by sha256) and get/upsert for the five settings
singletons. Repository tests run every query against a migrated temp
database.

make sqlc regenerates with the pinned sqlc v1.31.1 (dev tool only, not in
go.mod); make sqlc-check regenerates and fails on any drift in
internal/db, and CI runs it after make test.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -5,7 +5,9 @@
 # The Makefile is the single build definition: CI runs `make test` and
 # `make build` so it fails whenever either target would, and the binary
 # carries the Makefile's -trimpath and version-stamped -ldflags (the
-# `make build` log shows the -X main.version=... value).
+# `make build` log shows the -X main.version=... value). `make sqlc-check`
+# fails when the committed internal/db code is stale against sqlc.yaml,
+# migrations/ and migrations/queries/.
 name: CI
 
 on: [push, pull_request]
@@ -28,5 +30,10 @@ jobs:
       - name: make test
         run: make test
 
+      - name: make sqlc-check
+        run: |
+          make sqlc-install
+          make sqlc-check SQLC="$(go env GOPATH)/bin/sqlc"
+
       - name: make build
         run: make build