Paginate tables that can grow large

Sorting/CSV export were already app-wide; tables with a real chance of
growing into dozens or hundreds of rows (a busy tailnet, a big DNS
zone, a homelab's full IP inventory, a Gitea org with many repos, ...)
had no pagination at all, making them a long unbroken scroll.

New usePagination hook (client-side slicing over an already-sorted/
filtered array, 20 rows per page) and a matching Pagination component
(Prev/Next + "Page X of Y (N total)", hidden entirely when everything
fits on one page). The current page is clamped to the valid range on
every render rather than reset via an effect, so switching to a
smaller data set (a different selected integration, a filter that
narrows the result) can never strand the view on a now-nonexistent
page -- no per-page "reset on change" wiring needed anywhere.

Applied to Audit Log, DNS zones and records, IP Addresses, Secrets,
Servers (manage table), Docker containers, Proxmox guests, Semaphore
templates, Gitea repos, and Tailscale devices. CSV export keeps
exporting the full sorted/filtered array regardless of which page is
currently shown -- pagination only affects what's rendered on screen.
Left the already-small tables (Synology volumes/disks, Users,
Integrations, per-node Proxmox storage) unpaginated, and left the
Diagnostic Log's existing server-driven pagination as-is rather than
bolting a second, different pagination scheme onto it.

Verified the clamping logic directly: a normal page, the trailing
partial page, a requested page beyond the end (clamps to the last
valid page instead of rendering empty), and an empty result set
(clamps to page 0 with a page count of 1 instead of a negative range).

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

README.md

@@ -96,7 +96,11 @@ All modules from the original plan are built:
 - Every table in the app is click-to-sort on any column (numbers, booleans,
   and dates/text sort correctly regardless of how the column formats them)
   and has an "Export CSV" button next to it that exports whatever's
-  currently sorted/filtered.
+  currently sorted/filtered. Tables that can realistically grow large
+  (DNS zones/records, IP Addresses, Secrets, Servers, Audit Log, and each
+  integration's device/container/guest/repo/template list) are paginated
+  20 rows at a time — CSV export still covers every sorted/filtered row,
+  not just the current page.
 - **Settings** (admin-only) — notification channels (Gotify, ntfy, SMTP,
   generic webhook) with per-channel test buttons, per-event toggles (DNS
   record added/updated/deleted, daily secret-expiry reminder and daily