feat: Claude usage API + multi-account dashboard display

- Replace expect/CLI hack with direct HTTP API call
  (GET api.anthropic.com/api/oauth/usage with OAuth token)
- Add fetchAllClaudeUsage() for per-token usage fetching
- Export getAllTokens() from token-rotation for usage queries
- Dashboard shows each account separately (Claude1⚡, Claude2)
  with ⚡ for active token, 🚫 for rate-limited

src/claude-usage.test.ts

@@ -1,53 +1,28 @@
 import { describe, expect, it } from 'vitest';
 
-import { parseClaudeUsagePanel } from './claude-usage.js';
+import type { ClaudeUsageData } from './claude-usage.js';
 
-describe('parseClaudeUsagePanel', () => {
-  it('parses session and weekly usage from Claude CLI panel output', () => {
-    const sample = `
-Settings: Status Config Usage
-Loading usage data...
+describe('ClaudeUsageData', () => {
+  it('represents the API response structure correctly', () => {
+    const data: ClaudeUsageData = {
+      five_hour: { utilization: 45.2, resets_at: '2026-03-23T17:00:00Z' },
+      seven_day: { utilization: 72.1, resets_at: '2026-03-29T00:00:00Z' },
+      seven_day_sonnet: { utilization: 60.0, resets_at: '2026-03-29T00:00:00Z' },
+      seven_day_opus: { utilization: 80.0, resets_at: '2026-03-29T00:00:00Z' },
+    };
 
-Current session
-████ 4% used
-Resets in 8m (Asia/Seoul)
-
-Current week (all models)
-███████████████████████████████████████ 78% used
-Resets Mar 17 at 10pm (Asia/Seoul)
-
-Current week (Sonnet only)
-███ 6% used
-Resets Mar 17 at 11pm (Asia/Seoul)
-
-Extra usage
-Extra usage not enabled • /extra-usage to enable
-`;
-
-    expect(parseClaudeUsagePanel(sample)).toEqual({
-      five_hour: {
-        utilization: 4,
-        resets_at: 'Resets in 8m (Asia/Seoul)',
-      },
-      seven_day: {
-        utilization: 78,
-        resets_at: 'Resets Mar 17 at 10pm (Asia/Seoul)',
-      },
-    });
+    expect(data.five_hour?.utilization).toBe(45.2);
+    expect(data.seven_day?.utilization).toBe(72.1);
+    expect(data.seven_day_sonnet?.utilization).toBe(60.0);
+    expect(data.seven_day_opus?.utilization).toBe(80.0);
   });
 
-  it('converts percent left into used percent', () => {
-    const sample = `
-Current session
-60% left
-Resets in 1h
-`;
+  it('allows partial data (only five_hour)', () => {
+    const data: ClaudeUsageData = {
+      five_hour: { utilization: 10, resets_at: '2026-03-23T17:00:00Z' },
+    };
 
-    expect(parseClaudeUsagePanel(sample)).toEqual({
-      five_hour: {
-        utilization: 40,
-        resets_at: 'Resets in 1h',
-      },
-    });
+    expect(data.five_hour?.utilization).toBe(10);
+    expect(data.seven_day).toBeUndefined();
   });
 });