Upgrade explorer to EACL v8

[theronic]

Summary

• pin eacl and eacl-datascript to EACL release/v8.0 commit 34ca6b15039daf8f651dd9ef2ccfb95d483ab112
• migrate resource and relationship pagination from v7 :limit/:cursor responses to v8 Relay :first/:after requests and :page-info
• adopt the v8 complete-count contract and canonical DataScript client construction
• bundle the exact generated browser authority from the matching successful EACL CI run and load it before the app/test builds
• update the explorer label, documentation, and browser tests for EACL v8

Why

EACL v8 removes the DataScript v7 list/count contract and the deprecated :entity->object-id client option. It also requires a generated JavaScript authority that is packaged by EACL CI but is not present in a source-only git dependency checkout. Without these changes the explorer cannot compile or paginate against the pinned v8 commit.

Impact

The explorer keeps its existing UI and local DataScript workflow while using v8 authenticated Relay cursors, v8 counting, and the v8 generated decision authority.

Validation

• browser test suite: 36 tests, 176 assertions, 0 failures/errors
• app and test builds: 0 warnings
• production Pages release build: 0 warnings
• live browser smoke test at http://localhost:18091/index.html: seeded 10,000 servers, observed 4,000 authorized servers for user-1, and advanced from resource page 1 to page 2
• generated authority SHA-256: 20b0c605d5211261154c1e1f41530475a9e65d4b7575e3a3e55497e5d22833f5