chore: temporary demo mode for previewing populated dashboard

PULP_DEMO=true 시 가짜 Pulp 데이터로 대시보드 미리보기. 실제 Pulp 연동/단계5 전 제거 가능.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/demo.py

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+"""임시 데모용 가짜 Pulp 클라이언트 — 성공 대시보드 미리보기.
+
+PULP_DEMO=true 일 때만 사용된다. 실제 Pulp 서버 없이 화면을 확인하기 위한 것.
+정식 기능과 무관하므로 단계 5(또는 실제 Pulp 연동 시) 제거 가능.
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+_REPOS: list[dict[str, Any]] = [
+    {
+        "pulp_href": "/pulp/api/v3/repositories/rpm/rpm/0001/",
+        "name": "rocky9-baseos",
+        "latest_version_href": "/pulp/api/v3/repositories/rpm/rpm/0001/versions/3/",
+        "repo_config": {"gpgcheck": 1, "repo-gpgcheck": 1},
+    },
+    {
+        "pulp_href": "/pulp/api/v3/repositories/rpm/rpm/0002/",
+        "name": "rocky9-appstream",
+        "latest_version_href": "/pulp/api/v3/repositories/rpm/rpm/0002/versions/2/",
+        "repo_config": {"gpgcheck": 1, "repo-gpgcheck": 1},
+    },
+    {
+        "pulp_href": "/pulp/api/v3/repositories/rpm/rpm/0003/",
+        "name": "ubuntu2204-main",
+        "latest_version_href": "/pulp/api/v3/repositories/rpm/rpm/0003/versions/5/",
+        "repo_config": {"gpgcheck": 1, "repo-gpgcheck": 0},  # 부분 검증
+    },
+    {
+        "pulp_href": "/pulp/api/v3/repositories/rpm/rpm/0004/",
+        "name": "internal-tools",
+        "latest_version_href": "/pulp/api/v3/repositories/rpm/rpm/0004/versions/1/",
+        "repo_config": {},  # 미설정
+    },
+]
+
+_VERSIONS: dict[str, dict[str, Any]] = {
+    "/pulp/api/v3/repositories/rpm/rpm/0001/versions/3/": {
+        "pulp_created": "2026-06-15T02:11:00Z",
+        "content_summary": {"present": {"rpm.package": {"count": 4821}}},
+    },
+    "/pulp/api/v3/repositories/rpm/rpm/0002/versions/2/": {
+        "pulp_created": "2026-06-14T23:40:00Z",
+        "content_summary": {"present": {"rpm.package": {"count": 8934}}},
+    },
+    "/pulp/api/v3/repositories/rpm/rpm/0003/versions/5/": {
+        "pulp_created": "2026-06-16T08:05:00Z",
+        "content_summary": {"present": {"deb.package": {"count": 12500}}},
+    },
+    "/pulp/api/v3/repositories/rpm/rpm/0004/versions/1/": {
+        "pulp_created": "2026-05-30T11:20:00Z",
+        "content_summary": {"present": {"rpm.package": {"count": 87}}},
+    },
+}
+
+
+class DemoPulpClient:
+    def close(self) -> None:  # 인터페이스 호환
+        pass
+
+    def status(self) -> dict[str, Any]:
+        return {"online": True, "demo": True}
+
+    def list_repos(self) -> list[dict[str, Any]]:
+        return _REPOS
+
+    def get_version(self, version_href: str) -> dict[str, Any]:
+        return _VERSIONS.get(version_href, {})