P2.6: drop @deprecated AuditService delegators, move @internal helpers to AuditRecorder

[sjelfull]

P2.6: drop @deprecated AuditService delegators, move @internal helpers to AuditRecorder

Removes the backward-compatibility shim layer that was keeping the old AuditService API alive. The delegator methods (AuditService::record(), AuditService::getRecords(), etc.) were marked @deprecated in P1.1 and have been dead weight since P2.3 finished rewiring all event listeners to the handler services. This branch deletes them and moves the @internal helper methods that legitimately belong on AuditRecorder (where they were always called from).

The result: AuditService drops from ~500 LOC to a thin service-locator shell. AuditRecorder gains the helpers it was already using via cross-service calls.

What changed

• src/services/AuditService.php — 427 lines deleted. All @deprecated delegator methods removed. The class now only wires up the service container.
• src/services/AuditRecorder.php (+116 LOC) — absorbs the @internal helpers previously living in AuditService: applyOverrides(), buildSnapshot(), and related utilities. No behavior change — these were already called from AuditRecorder via $this->audit->auditService->helper().
• 8 handler files (BackupHandler, ElementHandler, PluginHandler, RouteHandler, SchemaHandler, SettingsHandler, UserGroupHandler, UserHandler) — update internal calls from $this->audit->auditService->helper() to $this->recorder->helper() now that the helpers live on AuditRecorder.
• 8 test files — update any remaining AuditService:: references to the correct AuditRecorder:: surface.

Tests

• Test count unchanged (refactor — no new behavior)
• ECS clean
• PHPStan clean
• Fresh-DB green

Stacked on

p2.5-ci-php-matrix-hygiene (#111)

[sjelfull]

This change is part of the following stack:

• Phase 1.1 — Foundation: AuditEvent enum + JSON snapshot migration #90
  • Phase 1.2 — Core services: AuditRecorder + FieldDiffService + HandlerRegistry #91
    • Phase 1.3 — Field handlers: 15 handlers for native + third-party fields #92
      • Phase 1.4 — Project config tracking: 8 config areas #93
        • Phase 1.5 — UI: DiffRenderer + 20 Twig templates + asset bundle #94
          • Phase 1.6 — Tests: migration + integration + enum coverage (+19 tests) #95
            • Phase 2.1 — Decompose AuditService: ElementHandler, UserHandler, UserGroupHandler #96
              • Phase 2.2 — Decompose AuditService: Schema/Route/Backup/Plugin/Settings handlers #97
                • Phase 2.3 — Repoint event wiring from AuditService to handler services #98
                  • Phase 2.4 — Migrate Pest tests from AuditModel::EVENT_* to AuditEvent enum #99
                  • Phase 2.5 — CI: PHP 8.2/8.3/8.4 matrix + v3 branch trigger #111
                  • Phase 3.0 — Docs: ship escape hatch (filter-records + getting-started + events-and-recording) #110
                  • P2.6: drop @deprecated AuditService delegators, move @internal helpers to AuditRecorder #112 ◀
                  • P2.7: drop @deprecated EVENT_/USER_ string constants from AuditModel, migrate to AuditEvent::Xxx->value #113
                  • P2.8: strip section-divider banners and boilerplate file/class headers #114
                  • P2.9: convert tests to exercise real Craft APIs instead of synthetic event objects #115
                  • P3.1: batch processing foundation — BatchService + auto-attach + 3 enum cases + 13 tests #116
                  • P3.2: migrate ResaveElements to BatchService — kills cache-key concurrency bug #117
                  • P3.4: Feed Me bake-in — auto-batch each feed import via EVENT_BEFORE/AFTER_PROCESS_FEED #119
                  • P3.3: CP UI — expandable indented batch children in audit log index #120
                  • P3.5: Feed Me integration tests — real class-string event dispatch verified #121
                  • P3.6: Fix snapshot column double-JSON-encoding (FRE-239) #122
                  • P3.7: Stack-wide comment cleanup pass #123

_{Change managed by git-spice.}