feat: FastAPI console with dashboard, Pulp client, healthz (stages 0-1)

- config: PULP_* env + 사내 CA(verify=) 대응
- pulp_client: Basic Auth get/post/patch, status/list_repos/get_version
- BFF 라우트: GET / (대시보드), GET /repos (조각), GET /healthz
- views: Pulp JSON → 표시 모델 (GPG 검증 배지 3단계, 요약 집계)
- HTMX + Jinja 템플릿, vendored pico.css/htmx.js (CDN 의존 0)
- 브라우저는 Pulp 직접 호출 안 함 — 모두 BFF 경유 (스펙 §2)
- 테스트: pulp_client(respx), 라우트(dependency_overrides), views 순수함수

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

app/templates/dashboard.html

@@ -0,0 +1,21 @@
+{% extends "base.html" %}
+
+{% block content %}
+<section>
+  <h2>상태</h2>
+  <!-- 로드 시 1회 + 10초마다 Pulp 연결 상태 폴링 -->
+  <div hx-get="/healthz" hx-trigger="load, every 10s" hx-swap="innerHTML" style="margin-top:12px;">
+    <span class="status-line status-loading">연결 확인 중…</span>
+  </div>
+</section>
+
+<section>
+  <div class="section-head">
+    <h2>저장소</h2>
+    <button hx-get="/repos" hx-target="#repo-list" hx-swap="outerHTML" class="secondary">
+      새로고침
+    </button>
+  </div>
+  {% include "partials/repo_list.html" %}
+</section>
+{% endblock %}