fix: add HealthCheckListResponse type to match API response structure

- Added HealthCheckListResponse type { checks: [...], total: number }
- Updated healthChecksApi.list() return type to HealthCheckListResponse
- Fixed HostDetailPage to use res.data?.checks instead of Array.isArray
- Added Target column to health checks table
- Added git pre-commit/pre-push hooks to prevent format CI failures
- Updated lessons.md

scripts/git-hooks/pre-commit

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+# =============================================================================
+# Linux Patch Manager — Pre-Commit Hook
+# =============================================================================
+# Auto-formats Rust code and runs frontend type check before each commit.
+# Prevents CI format-check failures by ensuring code is always formatted.
+# Install: ./scripts/git-hooks/install.sh
+# =============================================================================
+
+set -euo pipefail
+
+REPO_ROOT="$(git rev-parse --show-toplevel)"
+
+# ── Rust auto-format ──────────────────────────────────────────────────────────
+if [[ -f "${REPO_ROOT}/Cargo.toml" ]]; then
+    echo "[pre-commit] Running cargo fmt --all ..."
+    cargo fmt --all --manifest-path "${REPO_ROOT}/Cargo.toml" 2>/dev/null
+
+    # Re-stage any files that cargo fmt reformatted (including previously unstaged)
+    STAGED_RS=$(git diff --name-only --diff-filter=ACM -- '*.rs')
+    if [[ -n "${STAGED_RS}" ]]; then
+        git add ${STAGED_RS}
+    fi
+fi
+
+# ── Frontend type check ─────────────────────────────────────────────────────
+if [[ -f "${REPO_ROOT}/frontend/package.json" ]]; then
+    echo "[pre-commit] Running TypeScript type check ..."
+    cd "${REPO_ROOT}/frontend"
+    npx tsc --noEmit 2>/dev/null
+fi
+
+echo "[pre-commit] All checks passed ✓"