Add a Generator page for server names, usernames, and passwords

New "Generator" nav item, open to every role since it's a pure
client-side utility with no data mutation. Three independent cards:
- Server name: picks from Swedish girl names or Disney characters (or
  both), skipping any name already used by an existing server —
  checked against the real server list, not just avoiding duplicates
  within one session.
- Username: adjective+animal with a configurable separator and an
  optional 2-digit suffix.
- Password: length slider, per-charset toggles, an "exclude ambiguous
  characters" option (0/O, 1/l/I), and a rough entropy/strength
  readout. Uses crypto.getRandomValues with rejection sampling (not
  Math.random or a plain modulo), since a biased password generator
  is a real security footgun.

Nothing generated here is sent to or stored on the server — it's
computed entirely in the browser and only reaches the backend if the
user pastes it into some other form themselves (e.g. Secrets, adding
a server).

Verified generators.ts directly: collision avoidance always returns
the one remaining unused name when every other option in a themed
list is taken, the full-list-exhausted fallback produces a numbered
name that still doesn't collide, matching is case-insensitive,
per-charset password generation only ever produces characters from
the selected sets, excludeAmbiguous holds across 200 40-character
samples, entropy math matches the expected log2 formula, and a
5000-sample single-character distribution came out uniform (469-521
per digit against an expected 500, no modulo bias) confirming the
rejection-sampling RNG is unbiased.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

web/src/App.tsx

@@ -19,6 +19,7 @@ import Semaphore from "./pages/Semaphore";
 import Gitea from "./pages/Gitea";
 import Proxmox from "./pages/Proxmox";
 import Synology from "./pages/Synology";
+import Generator from "./pages/Generator";
 import Settings from "./pages/Settings";
 import NotificationSettings from "./pages/settings/NotificationSettings";
 import BadgeSettings from "./pages/settings/BadgeSettings";
@@ -86,6 +87,7 @@ export default function App() {
         <Route path="/ipam" element={<Ipam user={user} />} />
         <Route path="/secrets" element={<Secrets user={user} />} />
         <Route path="/integrations" element={<Integrations user={user} />} />
+        <Route path="/generator" element={<Generator />} />
         <Route path="/docker" element={<Docker user={user} />} />
         <Route path="/tailscale" element={<Tailscale user={user} />} />
         <Route path="/semaphore" element={<Semaphore user={user} />} />