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/definitions/options-stats.ts

@@ -0,0 +1,33 @@
+import { ResolvedConfig } from '../../types.js';
+import { ConfigOptionRegistryEntry } from './shared.js';
+
+export function buildStatsConfigOptionRegistry(
+  defaultConfig: ResolvedConfig,
+): ConfigOptionRegistryEntry[] {
+  return [
+    {
+      path: 'stats.toggleKey',
+      kind: 'string',
+      defaultValue: defaultConfig.stats.toggleKey,
+      description: 'Key code to toggle the stats overlay.',
+    },
+    {
+      path: 'stats.serverPort',
+      kind: 'number',
+      defaultValue: defaultConfig.stats.serverPort,
+      description: 'Port for the stats HTTP server.',
+    },
+    {
+      path: 'stats.autoStartServer',
+      kind: 'boolean',
+      defaultValue: defaultConfig.stats.autoStartServer,
+      description: 'Automatically start the stats server on launch.',
+    },
+    {
+      path: 'stats.autoOpenBrowser',
+      kind: 'boolean',
+      defaultValue: defaultConfig.stats.autoOpenBrowser,
+      description: 'Automatically open the stats dashboard in a browser when the server starts.',
+    },
+  ];
+}