feat(api): public /api/health with a database check

[ralyodio]

Adds GET /api/health for status.profullstack.com (Gatus), which today can only check the home page.

• 200 {"status":"ok","db":"ok"} after one HEAD select on profiles via the existing service client, 3s timeout
• 503 {"status":"error","db":"down"} on any failure; no error details leak
• Cache-Control: no-store
• proxy.ts returns NextResponse.next() for this path first, so the check is not gated, metered or session-refreshed

Why it was 404: no route existed.

Verified: tsc --noEmit clean, eslint clean on changed files, src/proxy.test.ts passes.

🤖 Generated with Claude Code

[github-actions]

ThreatCrush Security Scan

46 finding(s)

HIGH/CRITICAL: 1 | MEDIUM: 7 | LOW: 38

Severity	Rule	Location
HIGH	js-ssrf-outbound-request	scripts/scan-all-skills.ts:38
MEDIUM	js-open-redirect	src/app/agent-login/AgentLoginForm.tsx:38
MEDIUM	js-unescaped-html-sink	src/app/blog/[slug]/page.tsx:79
MEDIUM	js-open-redirect	src/app/dashboard/subscription/page.tsx:100
MEDIUM	js-open-redirect	src/app/dashboard/subscription/page.tsx:133
MEDIUM	js-open-redirect	src/components/funding/FundingClient.tsx:138
MEDIUM	js-dynamic-code-execution	src/lib/skills/metadata-extract.ts:300
MEDIUM	js-dynamic-code-execution	src/lib/skills/security-scan.ts:48
LOW	secret-generic-credential	cli/src/commands/auth.test.ts:66
LOW	secret-generic-credential	cli/src/commands/auth.test.ts:85
LOW	secret-generic-api-key	docs/agents/integration-guide.md:893
LOW	secret-generic-credential	src/app/api/auth/login/route.test.ts:53
LOW	secret-generic-credential	src/app/api/auth/login/route.test.ts:68
LOW	secret-generic-credential	src/app/api/auth/login/route.test.ts:87
LOW	secret-generic-credential	src/app/api/auth/signup/route.test.ts:158
LOW	secret-generic-credential	src/app/api/auth/signup/route.test.ts:182
LOW	secret-generic-credential	src/app/api/auth/signup/route.test.ts:193
LOW	secret-generic-credential	src/app/api/auth/signup/route.test.ts:232
LOW	js-dynamic-code-execution	src/app/api/skills/[slug]/scan/route.test.ts:212
LOW	js-dynamic-code-execution	src/app/api/skills/[slug]/scan/route.test.ts:223
LOW	js-dynamic-code-execution	src/app/api/skills/[slug]/scan/route.test.ts:239
LOW	secret-generic-credential	src/lib/api.test.ts:126
LOW	secret-generic-credential	src/lib/api.test.ts:131
LOW	js-dynamic-code-execution	src/lib/skills/composite-scanner.test.ts:106
LOW	js-dynamic-code-execution	src/lib/skills/secureclaw-scanner.test.ts:36
LOW	js-dynamic-code-execution	src/lib/skills/secureclaw-scanner.test.ts:44
LOW	js-dynamic-code-execution	src/lib/skills/secureclaw-scanner.test.ts:66
LOW	js-dynamic-code-execution	src/lib/skills/secureclaw-scanner.test.ts:81
LOW	js-dynamic-code-execution	src/lib/skills/secureclaw-scanner.test.ts:94
LOW	js-dynamic-code-execution	src/lib/skills/secureclaw-scanner.test.ts:103
LOW	js-dynamic-code-execution	src/lib/skills/secureclaw-scanner.test.ts:118
LOW	js-dynamic-code-execution	src/lib/skills/secureclaw-scanner.test.ts:144
LOW	js-dynamic-code-execution	src/lib/skills/secureclaw-scanner.test.ts:162
LOW	js-dynamic-code-execution	src/lib/skills/security-scan.test.ts:28
LOW	js-dynamic-code-execution	src/lib/skills/url-import.test.ts:178
LOW	js-dynamic-code-execution	src/lib/skills/url-import.test.ts:191
LOW	secret-jwt	src/lib/supabase/service.test.ts:16
LOW	secret-jwt	src/lib/supabase/service.test.ts:40
LOW	secret-generic-credential	src/lib/validations.test.ts:148
LOW	secret-generic-credential	src/lib/validations.test.ts:512
LOW	secret-generic-credential	src/lib/validations.test.ts:523
LOW	secret-generic-credential	src/lib/validations.test.ts:538
LOW	secret-generic-credential	src/lib/validations.test.ts:548
LOW	secret-generic-credential	src/lib/validations.test.ts:557
LOW	secret-generic-credential	src/lib/validations.test.ts:567
LOW	secret-generic-credential	src/lib/validations.test.ts:582

Snippets are redacted; ThreatCrush never prints matched credential material.