feat(gui): add routing profiles and why-this-route views

[Wibias]

Summary

RI-10 - the final PR of the Router Intelligence / Routing Control Plane
programme. Adds the dashboard surfaces (routing profiles, dry-run
evaluation, routing analytics, why-this-route in the Logs detail) plus the
documentation set across all locales.

GUI surfaces

• New Routing page (#routing, gui/src/pages/RoutingProfiles.tsx):
  • profile list with public model slug and revision digest;
  • profile detail: candidates, hard requirements, optimization weights,
    limits, unknown-evidence policy;
  • dry-run form (context window, tools, image, structured output) calling
    POST /api/routing-profiles/dry-run with a candidate/eligibility/
    exclusions/score table - the selected candidate is marked;
  • routing analytics panel from /api/routing-analytics: requests, success
    and fallback rates, p50/p95/p99, cooldown failures, confidence, explicit
    truncated-history indicator, and the provider/model breakdown.
• Logs detail dialog: a "Route decision" section renders the durable
  trace inline (route kind, profile + revision, selected candidate + reason,
  candidate eligibility marks); pre-trace rows show an honest empty state.
• Unknown evidence is never rendered as green health: values are "–" until
  evidence exists, and the analytics panel carries the confidence label.
• All visible strings use locale keys in all six locales (en/de/ja/ko/ru/zh);
  the TKey set is compile-checked.
• Accessible markup: buttons/labels/aria-pressed, keyboard-operable
  profile selection.

Docs

• reference/configuration/routing.md (all five locales) now covers:
  routingProfiles schema, alias/collision rules, dry-run + evaluate CLI,
  the combos-vs-profiles distinction, the request-history/routing-analytics/
  route-decision APIs, and migration notes (disposable index, no
  auto-tuning).

Design notes

• Reuses the existing dashboard grammar (.page-head, .panel, .card,
  .badge, .btn, .table); no enterprise redesign.
• One small CSS addition (styles.css): .table and .checkbox follow the
  existing .tbl grammar.

Privacy / security

• The GUI renders only the already-bounded trace/evidence fields; no prompts,
  credentials, or raw responses.
• bun run privacy:scan passes.

Compatibility

• Additive page + nav entry; existing pages untouched. /api/* contracts
  unchanged.

Dependency

• Stacked on RI-01..RI-09 (feat(routing): record durable route decision traces #1003, feat(control-plane): add indexed cursor-paginated request history #1004, feat(analytics): add route reliability and latency analytics #1005, feat(routing): add validated routing policy profiles #1011, feat(routing): execute capability-aware policy profiles #1012, feat(routing): add evidence-based route health scoring #1013, feat(routing): add quota-aware policy scoring #1014,
  feat(routing): add cost-aware policy scoring and limits #1015, feat(control-plane): expose route decision explanations #1016). Branch base: feat/ri-09-route-explainability-api head
  6e69a4a68.

Non-goals

• No generic dashboard redesign.
• No invented health state: unknown evidence renders neutral, never green.

Local verification (exact)

• bun x tsc --noEmit -> PASSED (0 errors)
• bun run lint:gui -> PASSED (0 errors)
• bun run build:gui -> PASSED (production build + prepare:package)
• bun run test (12 routing suites) -> 258/258 pass
• bun run privacy:scan -> passed
• docs-site bun run build -> 216 pages, PASSED
• Screenshot: live same-origin capture against a temporary config with a
  real profile + history (see top of this description)

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 4fdeb6b0-7dfa-4da1-821d-14cc103d70bc

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

---

_{Comment @coderabbitai help to get the list of available commands.}

[Wibias]

RI-10 UI screenshot (attached)