feat(operations): show real claude.ai subscription usage % on /operations

Surfaces the 5-hour / weekly / weekly-Opus utilization the Claude Code status
bar shows — the authoritative number, not a token estimate. Design approved via
the Claude Design gate (card 02c-operations-usage.html).

Three layers:
- court-fetch-service (host bridge): new GET /usage reads the OAuth token from
  ~/.claude/.credentials.json and proxies /api/oauth/usage with the required
  claude-code User-Agent. Read-only, no auth (like /pm2). Host-only — the token
  never enters the container.
- web/app.py: _ops_subscription_usage() proxies the bridge /usage; the
  /api/operations snapshot gains a `subscription_usage` field (null when the
  undocumented endpoint is unreachable).
- web-ui: SubscriptionUsagePanel renders three meters (label · % · bar · reset)
  at the top of /operations; bar turns amber >75% / red >90%; hidden when usage
  is null. Types added to operations.ts (hand-maintained snapshot type).

Also fixes a pre-existing react/no-unescaped-entities lint error in
learning-panel.tsx (escaped a `"` in Hebrew text — renders identically).

tsc --noEmit passes; lint error count 0. (Full next build is blocked only by the
manual-worktree node_modules symlink — the Docker build has real node_modules.)

Invariants: G2 (usage surfaced through the existing host bridge + /api/operations
snapshot — no parallel control path).

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

web-ui/src/components/training/learning-panel.tsx

@@ -106,7 +106,7 @@ function ProposalReview({ pairId }: { pairId: string }) {
   return (
     <div className="rounded-md bg-gold-wash/30 border border-gold/40 p-3 space-y-3 text-[0.8rem]">
       <p className="text-ink-muted text-[0.75rem]">
-        הצעת הדיסטילציה (סגנון/שיטה בלבד — INV-LRN5). בחר/י מה לאמץ; ייכתב לערוצים שהכותב צורך (שער-יו"ר).
+        הצעת הדיסטילציה (סגנון/שיטה בלבד — INV-LRN5). בחר/י מה לאמץ; ייכתב לערוצים שהכותב צורך (שער-יו&quot;ר).
       </p>
       {data.overall_assessment && (
         <p className="italic text-ink-muted">{data.overall_assessment}</p>