feat(stats): add stats server, API endpoints, config, and Anki integration

- Hono HTTP server with 20+ REST endpoints for stats data
- Stats overlay BrowserWindow with toggle keybinding
- IPC channel definitions and preload bridge
- Stats config section (toggleKey, serverPort, autoStartServer, autoOpenBrowser)
- Config resolver for stats section
- AnkiConnect proxy endpoints (guiBrowse, notesInfo)
- Note ID passthrough in card mining callback chain
- Stats CLI command with autoOpenBrowser respect

src/config/resolve/stats.ts

@@ -0,0 +1,36 @@
+import { ResolveContext } from './context';
+import { asBoolean, asNumber, asString, isObject } from './shared';
+
+export function applyStatsConfig(context: ResolveContext): void {
+  const { src, resolved, warn } = context;
+
+  if (!isObject(src.stats)) return;
+
+  const toggleKey = asString(src.stats.toggleKey);
+  if (toggleKey !== undefined) {
+    resolved.stats.toggleKey = toggleKey;
+  } else if (src.stats.toggleKey !== undefined) {
+    warn('stats.toggleKey', src.stats.toggleKey, resolved.stats.toggleKey, 'Expected string.');
+  }
+
+  const serverPort = asNumber(src.stats.serverPort);
+  if (serverPort !== undefined) {
+    resolved.stats.serverPort = serverPort;
+  } else if (src.stats.serverPort !== undefined) {
+    warn('stats.serverPort', src.stats.serverPort, resolved.stats.serverPort, 'Expected number.');
+  }
+
+  const autoStartServer = asBoolean(src.stats.autoStartServer);
+  if (autoStartServer !== undefined) {
+    resolved.stats.autoStartServer = autoStartServer;
+  } else if (src.stats.autoStartServer !== undefined) {
+    warn('stats.autoStartServer', src.stats.autoStartServer, resolved.stats.autoStartServer, 'Expected boolean.');
+  }
+
+  const autoOpenBrowser = asBoolean(src.stats.autoOpenBrowser);
+  if (autoOpenBrowser !== undefined) {
+    resolved.stats.autoOpenBrowser = autoOpenBrowser;
+  } else if (src.stats.autoOpenBrowser !== undefined) {
+    warn('stats.autoOpenBrowser', src.stats.autoOpenBrowser, resolved.stats.autoOpenBrowser, 'Expected boolean.');
+  }
+}