refactor(angular): deduplicate services/components — misc shrinks

[nitrobass24]

Context

From a repo-wide over-engineering audit (ponytail-audit). Frontend duplication and boilerplate — same logic, fewer lines. No behavior changes. Estimated cut: ~350 lines.

Findings

1. models/config.ts:111-200 (~55): eight per-section DEFAULT_* consts re-spread into DEFAULT_CONFIG; the section consts are referenced only by the dead barrel file and one spec. Collapse to a single DEFAULT_CONFIG object literal.
2. IntegrationsService vs PathPairsService (services/settings/, ~50): the same CRUD-over-HTTP service twice (BehaviorSubject + connected$ refresh + create/update/remove with identical tap + catchError(409 rethrow) bodies), differing only in BASE_URL and item type. Extract one generic collection-service base (generic over item type + URL), two thin instantiations. Keep the CLAUDE.md mutating-service contract (mutations in the returned pipeline via tap; IntegrationsService is the documented reference implementation — update CLAUDE.md's reference if the file moves).
3. Filter criteria class hierarchy (services/files/view-file-filter.service.ts:8-48,82-92, ~45): ViewFileFilterCriteria interface + AndFilterCriteria/StatusFilterCriteria/NameFilterCriteria classes + 4-branch buildFilterCriteria. The sibling ViewFileComparator is already a plain function type — do the same: type ViewFilePredicate = (f: ViewFile) => boolean; AndFilterCriteria becomes &&.
4. settings-page (pages/settings/settings-page.component.ts:55-66,96,162-191, ~38): 4 static buildXContext wrappers each calling applyDisableRules with 2 of 3 flags hardcoded false → one call site with active flags; 12 readonly OPTIONS_CONTEXT_X = OPTIONS_CONTEXT_X template aliases → one readonly OPTIONS map; OVERRIDE_NOTE field "retained for the unit spec" → fix the spec to import the source constant.
5. Double-click-confirm state machine copy-pasted verbatim into three components (pages/files/file.component.ts:199-227, pages/files/bulk-action-bar.component.ts:66-100, pages/settings/path-pairs.component.ts:254-276, ~35): confirmingDelete/confirmResetTimer/setConfirming/resetConfirmState/clearConfirmTimer, 3000ms. Extract one shared helper class or directive. Remember the OnPush + setTimeout rule: cdr.markForCheck() inside the timeout callback.
6. testDiscord/testTelegram byte-identical but for URL segment; same catchError message-extraction appears a third time in IntegrationsService.test; settings-page mirrors with testingDiscord/testingTelegram/discordResult/telegramResult + two identical handlers (services/settings/notifications.service.ts, settings-page.component.ts:83-86,243-267, ~33). Parameterize by channel.
7. LoggerService (services/utils/logger.service.ts, ~30): level is never written anywhere, so all four getters unconditionally return the bound console method; local LogLevel enum has no external consumer. Reduce to four console.* bindings (keep the injectable so specs can stub).
8. logs-page hand-rolled trackBy (pages/logs/logs-page.component.ts:103-110,204-233, ~30): two WeakMaps + monotonic counters encoding "track by object identity", which @for/*cdkVirtualFor do natively. Drop.
9. routes.ts:49-76 (~28): ROUTES hand-duplicates ROUTE_INFOS (same 5 paths/components). Derive: ROUTE_INFOS.map(({path, component}) => ({path, component})) + redirect.
10. mapState 26-line switch (services/files/view-file-capabilities.ts:90-119, ~24): ModelFileState and ViewFileStatus share byte-identical string values for all 12 shared members; only DEFAULT differs and the default: arm is unreachable. One ternary + cast. Also (~6): isExtractable and isLocallyDeletable are computed from the byte-identical expression (view-file-capabilities.ts:73-74,147-148, models/view-file.ts:22-23) — one flag; file.component.isExtractable() already ANDs isArchive at the call site.
11. STATE_LOOKUP/LEVEL_LOOKUP (models/model-file.ts:38-51, models/log-record.ts:31-38, ~22): tables mapping an enum's own uppercase keys onto its members → Enum[k as keyof typeof Enum] ?? DEFAULT.
12. Small ones (~40 total): ServerStatusService repeats a 12-line initial-status literal twice → disconnectedStatus(msg) factory (server-status.service.ts:15-27,56-68); ArrInstanceCreate → Omit<ArrInstance, 'id'> (models/arr-instance.ts:14-20); duplicate {success, message} interface declared in both integrations.service.ts:14-17 and notifications.service.ts:6-9 → one shared type; constant-returning NotificationRule.level functions → plain field (pages/main/header.component.ts:13-18,40-70); single-call-site URL builder lambdas → inline template strings (autoqueue.service.ts:13-15, config.service.ts:31-32); Localization class of nested static classes → plain const object (models/localization.ts); LogService.fetchHistory 4 sequential if HttpParams builds → Object.entries loop, and drop the before param nothing passes (services/logs/log.service.ts:9-14,62-69).

Constraints

• Zero user-visible behavior change.
• Specs updated alongside; no action/feature loses coverage.
• npx ng lint and npx ng test pass (Node ≥22.22.3).

Acceptance

• Each item applied or noted as intentionally skipped (with reason)
• Lint + unit tests + build pass

Workflow: branch refactor/angular-shrinks off develop, PR to develop. Items are independent — split if the diff gets big. Note item 1 conflicts textually with the barrel-file deletion issue; land whichever first and rebase.