perf: paginate user addresses and optimize ownership queries (#1105)

* perf: paginate user addresses and optimize mail ownership queries

* docs: document user address pagination

* fix: address pagination review feedback

* fix: cover user address pagination flows

* test: fix user mailbox tab selector

* test: stabilize remote address search flow

* test: stabilize user address browser flow

* fix: preserve address pagination compatibility

* refactor: simplify bound address query types

* refactor: reuse list query for bound addresses

* fix: preserve paginated address totals

* fix: preserve bound address helper contracts

* fix: require pagination for user addresses

* refactor: keep shared pagination behavior unchanged

* fix: align pagination docs and tests

* fix: clear stale address selections

* refactor: simplify user address pagination

* refactor: limit user address changes to pagination

* test: select a visible mailbox address

* fix: preserve bound address response fields

CHANGELOG_EN.md

@@ -16,6 +16,8 @@
 
 - fix: |Worker| Throttle address-activity touches to one write per day so user settings and mailbox access do not repeatedly update recently active addresses, reducing D1 writes (issue #1103)
 
+- feat: |User| Add server-side pagination for bound addresses, with totals queried only on the first page; validate user-mail list ownership with a JOIN and delete ownership with `EXISTS` instead of loading every bound address for large users (issue #1103)
+
 ### Testing
 
 - fix: |E2E| Add regression coverage ensuring user settings do not rewrite recent address activity timestamps