Add API tokens, CLI server API and shared core crate

- Personal API tokens (full/read scope, expiry, revoke) and CLI password login
- Cargo workspace: codecraft-core (types, providers, permission rules) shared by
  server and the upcoming terminal client; server re-exports the old paths
- CLI server API: /cli/config, /cli/skill, /cli/tool (server MCP tools),
  /llm/stream model gateway with budgets and usage per user
- Theme/language preferences mirrored to the server; personal memory endpoint
- Statistics: provider and mode tables stacked; CLI usage labelled
- cli/: work in progress (terminal client is being rewritten as a local TUI)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/prefsSync.ts

@@ -0,0 +1,37 @@
+import { get, put } from "./api";
+import { getLang, onLangChange, setLang } from "./i18n";
+import { applyTheme, getTheme, getThemeMode, onThemeChange, THEMES, type Theme, type ThemeMode } from "./theme";
+
+/**
+ * Theme and language are stored per device (localStorage) and mirrored to the
+ * server, so the command line client uses the same colours and language and a
+ * new device starts with your settings.
+ */
+let timer: ReturnType<typeof setTimeout> | undefined;
+let started = false;
+
+function push() {
+  clearTimeout(timer);
+  timer = setTimeout(() => {
+    void put("/account/prefs", { theme: getTheme(), theme_mode: getThemeMode(), lang: getLang() }).catch(() => undefined);
+  }, 800);
+}
+
+export async function startPrefsSync() {
+  if (started) return;
+  started = true;
+  // A device without own settings takes the server's.
+  const fresh = !localStorage.getItem("codecraft.theme") && !localStorage.getItem("codecraft.themeMode");
+  try {
+    const p = await get<{ theme?: string; theme_mode?: string; lang?: string }>("/account/prefs");
+    if (fresh && p.theme && THEMES.some((t) => t.id === p.theme)) {
+      applyTheme(p.theme as Theme, (p.theme_mode as ThemeMode) ?? "auto");
+    }
+    if (fresh && p.lang) setLang(p.lang);
+    if (!p.theme) push();
+  } catch {
+    /* offline or old server */
+  }
+  onThemeChange(push);
+  onLangChange(push);
+}