feat(infra): шаблон репозитория загрузок tgit-uploads — CI/CD, служебные скрипты, демо-сервис

- .sourcecraft/ci.yaml: push в main → check (compile · ruff мягкий · bandit · pytest по сервисам) → deploy
- .tgit/changed_services.py: изменённые services/<name>/ (без родителя — все сервисы)
- .tgit/run_tests.py: pytest каждого сервиса со своими requirements.txt
- deploy пока заглушка со списком сервисов — tgit-runner в #13
- services/hello: демо-сервис с тестом; tgit.yaml — формат настроек сервиса

Refs #7

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

infra/uploads-template/.tgit/run_tests.py

@@ -0,0 +1,34 @@
+"""Run pytest for every service that has tests, each in its own env with its own requirements.txt."""
+
+import subprocess
+import sys
+from pathlib import Path
+
+
+def has_tests(service: Path) -> bool:
+    return any(service.rglob("test_*.py")) or any(service.rglob("*_test.py"))
+
+
+def main() -> int:
+    failed: list[str] = []
+    services = sorted(p for p in Path("services").glob("*/") if p.is_dir()) if Path("services").is_dir() else []
+    for service in services:
+        if not has_tests(service):
+            print(f"[{service.name}] no tests — skipped")
+            continue
+        cmd = ["uv", "run", "--no-project", "--with", "pytest"]
+        req = service / "requirements.txt"
+        if req.is_file():
+            cmd += ["--with-requirements", str(req)]
+        cmd += ["pytest", "-q", str(service)]
+        print(f"[{service.name}] {' '.join(cmd)}", flush=True)
+        if subprocess.run(cmd).returncode != 0:
+            failed.append(service.name)
+    if failed:
+        print(f"tests failed: {', '.join(failed)}")
+        return 1
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())