feat(i18n): Add internationalization support

- Add i18n module with locale loading and translation helpers
- Add English (en) and French (fr) locale files with comprehensive translations
- Inject locale data into dashboard HTML via server
- Add /api/locales endpoint for locale info
- Add t() translation function to dashboard

Translated elements:
- Boot sequence (initialization, connecting, sweep complete)
- Header pills (sweep, sources, delta, risk indicators)
- Left rail panels (sensor grid, nuclear watch, risk gauges, space watch)
- Layer names and descriptions
- Map legend items
- Lower panels (news ticker, sweep delta, macro+markets, trade ideas)
- Right rail (OSINT stream)
- Badges and status indicators

Supported languages: English (default), French
Set CRUCIX_LANG=fr to switch to French

server.mjs

@@ -8,6 +8,7 @@ import { dirname, join } from 'path';
 import { fileURLToPath } from 'url';
 import { exec } from 'child_process';
 import config from './crucix.config.mjs';
+import { getLocale, currentLanguage, getSupportedLocales } from './lib/i18n.mjs';
 import { fullBriefing } from './apis/briefing.mjs';
 import { synthesize, generateIdeas } from './dashboard/inject.mjs';
 import { MemoryManager } from './lib/delta/index.mjs';
@@ -231,12 +232,20 @@ if (discordAlerter.isConfigured) {
 const app = express();
 app.use(express.static(join(ROOT, 'dashboard/public')));
 
-// Serve loading page until first sweep completes, then the dashboard
+// Serve loading page until first sweep completes, then the dashboard with injected locale
 app.get('/', (req, res) => {
   if (!currentData) {
     res.sendFile(join(ROOT, 'dashboard/public/loading.html'));
   } else {
-    res.sendFile(join(ROOT, 'dashboard/public/jarvis.html'));
+    const htmlPath = join(ROOT, 'dashboard/public/jarvis.html');
+    let html = readFileSync(htmlPath, 'utf-8');
+    
+    // Inject locale data into the HTML
+    const locale = getLocale();
+    const localeScript = `<script>window.__CRUCIX_LOCALE__ = ${JSON.stringify(locale).replace(/<\/script>/gi, '<\\/script>')};</script>`;
+    html = html.replace('</head>', `${localeScript}\n</head>`);
+    
+    res.type('html').send(html);
   }
 });
 
@@ -263,6 +272,15 @@ app.get('/api/health', (req, res) => {
     llmProvider: config.llm.provider,
     telegramEnabled: !!(config.telegram.botToken && config.telegram.chatId),
     refreshIntervalMinutes: config.refreshIntervalMinutes,
+    language: currentLanguage,
+  });
+});
+
+// API: available locales
+app.get('/api/locales', (req, res) => {
+  res.json({
+    current: currentLanguage,
+    supported: getSupportedLocales(),
   });
 });