ci: split workflows for linear development flow

Reshapes .gitea/workflows/ around the new main ← development ←
feature/* branching model:

- go-unit.yaml — Go unit tests, runs on push/PR matching Go paths
- ui-test.yaml — narrowed to Vitest + Playwright only (Go tests now
  live in go-unit.yaml)
- integration.yaml — testcontainers suite, fires on PR to
  development/main and on push to development
- dev-deploy.yaml — builds the stack and (re)deploys tools/dev-deploy/
  on every merge into development
- prod-build.yaml — builds prod images on push to main and uploads
  docker save bundles as artifacts (30-day retention)
- deploy-prod.yaml — workflow_dispatch placeholder for the future
  SSH-based rollout

ui-release.yaml is removed; its v* tag trigger is superseded by
prod-build.yaml plus the manual deploy-prod entry point.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/go-unit.yaml

@@ -0,0 +1,78 @@
+name: go-unit
+
+# Fast unit tests for the Go side of the monorepo. Runs on every push
+# and pull request whose path filter matches a Go source directory.
+# The integration suite (testcontainers-driven, slow) lives in
+# `integration.yaml` and only fires for PRs into `development`/`main`
+# and pushes to `development`.
+
+on:
+  push:
+    paths:
+      - 'backend/**'
+      - 'gateway/**'
+      - 'game/**'
+      - 'pkg/**'
+      - 'ui/core/**'
+      - 'go.work'
+      - 'go.work.sum'
+      - '.gitea/workflows/go-unit.yaml'
+      - '!**/*.md'
+  pull_request:
+    paths:
+      - 'backend/**'
+      - 'gateway/**'
+      - 'game/**'
+      - 'pkg/**'
+      - 'ui/core/**'
+      - 'go.work'
+      - 'go.work.sum'
+      - '.gitea/workflows/go-unit.yaml'
+      - '!**/*.md'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.work
+          cache: true
+
+      - name: Run Go tests
+        # client/ is the deprecated Fyne client; excluded from CI per
+        # ui/PLAN.md §74. -count=1 disables Go's test cache so a green
+        # run never depends on a previous runner's cached state. The
+        # backend suite is run with -p 1 because most backend packages
+        # spawn their own Postgres testcontainer, and parallel
+        # Postgres bootstraps starve each other on a constrained
+        # runner. pkg modules are listed one by one because ./pkg/...
+        # does not recurse across the independent go.work modules
+        # under pkg/.
+        run: |
+          go test -count=1 -p 1 ./backend/...
+          go test -count=1 \
+            ./gateway/... \
+            ./game/... \
+            ./ui/core/... \
+            ./pkg/calc/... \
+            ./pkg/connector/... \
+            ./pkg/cronutil/... \
+            ./pkg/error/... \
+            ./pkg/geoip/... \
+            ./pkg/model/... \
+            ./pkg/postgres/... \
+            ./pkg/redisconn/... \
+            ./pkg/schema/... \
+            ./pkg/storage/... \
+            ./pkg/transcoder/... \
+            ./pkg/util/...