feat: Profile health score system (scoring engine, API, frontend)

Health scoring engine with 4 dimensions: Gateway stability (40%), config
completeness (25%), skill consistency (20%), and Cron success rate (15%).
Grades A(80-100) B(60-79) C(40-59) D(0-39) with detailed deduction items
and fix suggestions per dimension.

API endpoints:
  - GET /health/scores — list all profiles with grade filter + sort
  - GET /health/scores/{profile} — detail with deductions + suggestions
  - POST /health/compare — multi-profile config/skill comparison
  - POST /health/calculate — manual recalculation (owner only)

Frontend HealthPage: grade distribution cards, score table with expandable
detail rows, batch compare view with diff highlighting, grade/select/sort
filters, and owner-only recalculation.

Data sources use placeholders (TODO: hermes CLI / file reads) but the full
scoring logic is implemented end-to-end.

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/api/health.ts

@@ -0,0 +1,69 @@
+import client from './client'
+
+/* ── types ── */
+
+export interface ScoreRow {
+  rank: number
+  name: string
+  total_score: number
+  grade: string
+  gateway_score: number
+  config_score: number
+  skill_score: number
+  cron_score: number
+  deduct_summary: string[]
+}
+
+export interface ScoreListResponse {
+  total: number
+  distribution: { A: number; B: number; C: number; D: number }
+  scores: ScoreRow[]
+}
+
+export interface DimensionDetail {
+  name: string
+  weight: string
+  score: number
+  max_score: number
+  deductions: string[]
+  suggestions: string[]
+}
+
+export interface ProfileScoreDetail {
+  profile_name: string
+  total_score: number
+  grade: string
+  calculated_at: string
+  dimensions: DimensionDetail[]
+}
+
+export interface CompareRow {
+  field: string
+  category: string
+  has_diff: boolean
+  [profileName: string]: unknown
+}
+
+export interface CompareResponse {
+  profiles: string[]
+  rows: CompareRow[]
+}
+
+export interface CalculateResponse {
+  message: string
+  count: number
+}
+
+/* ── API functions ── */
+
+export const getHealthScores = (params?: { grade?: string; sort?: string }) =>
+  client.get<ScoreListResponse>('/health/scores', { params })
+
+export const getProfileScore = (profile: string) =>
+  client.get<ProfileScoreDetail>(`/health/scores/${encodeURIComponent(profile)}`)
+
+export const compareProfiles = (profile_names: string[]) =>
+  client.post<CompareResponse>('/health/compare', { profile_names })
+
+export const recalculateScores = () =>
+  client.post<CalculateResponse>('/health/calculate')