feat: M0 monorepo skeleton with services, clients, deploy and CI

- api/openapi.yaml: contract with /healthz, /readyz, /api/v1/server-info
- services/api (Go): api with oapi-codegen strict server, goose migrations,
  readiness checks for Postgres/Redis; storage-agent stub with internal token
- services/recommender (Python, uv): FastAPI health/readiness/internal status,
  `pipu-rec serve` and `pipu-rec analyze` entrypoints
- packages: generated api-client, core (server URL + server check),
  i18n (ru/en + dictionary check), design-tokens (CSS vars + TS from tokens.json)
- apps/web: Vite + React shell showing server status, language switch
- apps/mobile: Expo (SDK 53) Android app with server connect screen
- deploy: Dockerfiles, compose (prod + dev), nginx template, install/update scripts
- .gitea/workflows: ci.yml and tag-based release.yml (images, signed APK, release)
- scripts/version.mjs: version and Android versionCode from git tag
- tests/fixtures/music/generate.sh: synthetic test library via ffmpeg
- docs: versionCode formula, OpenAPI 3.0.3, dev instructions in README

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

deploy/.env.example

@@ -0,0 +1,25 @@
+# Скопируйте в .env (install.sh делает это сам и генерирует секреты). Описание — docs/deployment.md.
+
+# --- Образы ---
+REGISTRY=git.example.lan/owner
+PIPU_VERSION=0.1.0
+PIPU_DATA=/srv/pipu
+HTTP_PORT=80
+
+# --- Секреты (install.sh заполнит случайными значениями) ---
+POSTGRES_PASSWORD=
+MEILI_MASTER_KEY=
+INTERNAL_TOKEN=
+
+# --- api / recommender ---
+# DATABASE_URL собирается в compose.yaml из POSTGRES_PASSWORD
+REDIS_URL=redis://redis:6379/0
+MEILI_URL=http://meilisearch:7700
+LOG_LEVEL=info
+SUPPORTED_LOCALES=ru,en
+MIN_ANDROID_VERSION_CODE=0
+
+# --- Самообновление Android (M5) ---
+GITEA_URL=https://git.example.lan
+GITEA_REPO=owner/pipu-music
+GITEA_TOKEN=