security: 보안 강제 시스템 구축 + 하드코딩 비밀번호 제거

보안 감사 결과 CRITICAL 2건, HIGH 5건 발견 → 수정 완료 + 자동화 구축.

[보안 수정]
- issue-view.js: 하드코딩 비밀번호 → crypto.getRandomValues() 랜덤 생성
- pushSubscriptionController.js: ntfy 비밀번호 → process.env.NTFY_SUB_PASSWORD
- DEPLOY-GUIDE.md/PROGRESS.md/migration SQL: 평문 비밀번호 → placeholder
- docker-compose.yml/.env.example: NTFY_SUB_PASSWORD 환경변수 추가

[보안 강제 시스템 - 신규]
- scripts/security-scan.sh: 8개 규칙 (CRITICAL 2, HIGH 4, MEDIUM 2)
  3모드(staged/all/diff), severity, .securityignore, MEDIUM 임계값
- .githooks/pre-commit: 로컬 빠른 피드백
- .githooks/pre-receive-server.sh: Gitea 서버 최종 차단
  bypass 거버넌스([SECURITY-BYPASS: 사유] + 사용자 제한 + 로그)
- SECURITY-CHECKLIST.md: 10개 카테고리 자동/수동 구분
- docs/SECURITY-GUIDE.md: 운영자 가이드 (워크플로우, bypass, FAQ)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

system1-factory/web/public/js/calendar.js

@@ -0,0 +1,59 @@
+// ✅ /js/calendar.js
+export function renderCalendar(containerId, onDateSelect) {
+  const container = document.getElementById(containerId);
+  if (!container) return;
+
+  let currentDate = new Date();
+  let selectedDateStr = '';
+
+  function drawCalendar(date) {
+    container.innerHTML = '';
+    const year = date.getFullYear();
+    const month = date.getMonth();
+    const firstDay = new Date(year, month, 1).getDay();
+    const lastDate = new Date(year, month + 1, 0).getDate();
+
+    const nav = document.createElement('div');
+    nav.className = 'nav';
+    const prev = document.createElement('button');
+    prev.textContent = '◀';
+    prev.addEventListener('click', () => {
+      currentDate = new Date(year, month - 1, 1);
+      drawCalendar(currentDate);
+    });
+    const title = document.createElement('div');
+    title.innerHTML = `<strong>${year}년 ${month + 1}월</strong>`;
+    const next = document.createElement('button');
+    next.textContent = '▶';
+    next.addEventListener('click', () => {
+      currentDate = new Date(year, month + 1, 1);
+      drawCalendar(currentDate);
+    });
+    nav.append(prev, title, next);
+    container.appendChild(nav);
+
+    ['일','월','화','수','목','금','토'].forEach(day => {
+      const el = document.createElement('div');
+      el.innerHTML = `<strong>${day}</strong>`;
+      container.appendChild(el);
+    });
+
+    for (let i = 0; i < firstDay; i++) container.appendChild(document.createElement('div'));
+
+    for (let i = 1; i <= lastDate; i++) {
+      const btn = document.createElement('button');
+      const ymd = `${year}-${String(month + 1).padStart(2, '0')}-${String(i).padStart(2, '0')}`;
+      btn.textContent = i;
+      btn.className = (ymd === selectedDateStr) ? 'selected-date' : '';
+      btn.addEventListener('click', () => {
+        selectedDateStr = ymd;
+        drawCalendar(currentDate);
+        onDateSelect(ymd);
+      });
+      container.appendChild(btn);
+    }
+  }
+
+  drawCalendar(currentDate);
+}
+