add CI/CD pipeline tooling (Makefile, Woodpecker, metadata)

Adapted from tools_build/phaser-tools for the Vite + TypeScript setup:
the web bundle comes from npm ci + npm run build instead of source
concatenation, otherwise the standard ci-version/ci-export/ci-upload/
ci-update flow applies (platform=phaser).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.woodpecker.yaml

@@ -0,0 +1,34 @@
+steps:
+  - name: version
+    image: alpine
+    commands:
+      - apk add --no-cache git make jq
+      - make ci-version
+
+  - name: build
+    image: git.teletypegames.org/internal/phaser-builder:latest
+    commands:
+      - make ci-export
+
+  - name: upload
+    image: alpine
+    environment:
+      DROPAREA_HOST: vps.teletype.hu
+      DROPAREA_PORT: 2223
+      DROPAREA_TARGET_PATH: /home/drop
+      DROPAREA_USER: drop
+      DROPAREA_SSH_PASSWORD:
+        from_secret: droparea_ssh_password
+    commands:
+      - apk add --no-cache make openssh-client sshpass
+      - make ci-upload
+
+  - name: update
+    image: alpine
+    environment:
+      UPDATE_SERVER: https://teletypegames.org
+      UPDATE_SECRET:
+        from_secret: update_secret_key
+    commands:
+      - apk add --no-cache make curl
+      - make ci-update