feat(ai): Phase 1 step 3-6 — LLM adapter + per-field AI suggest endpoint + UI

Approach C upgrade на templates foundation (!233). Admin может попросить AI
предложить новое поле — system prompt force'ит structural JSON Schema
fragment, admin review через accept/edit/reject. Bitemporal draft workflow
unchanged downstream.

## Backend
- `LlmAdapter` — OpenAI-compatible /v1/chat/completions client (Ollama,
  vLLM, OpenAI). Bean conditional на ordinis.ai.enabled=true.
- `AiSchemaService` — system prompt + 3 few-shot examples, JSON output
  parsing (с markdown fence stripping), validation (fieldName snake_case).
  In-memory circuit breaker: 10 fails в 60s → open 5 min.
- `AiSchemaController`:
  - GET /api/v1/ai/info → 200 (enabled) / 404 (disabled). Frontend probe.
  - POST /api/v1/ai/suggest-field → suggestion. Per-IP rate limit 30/min.
- All bean-conditional: ordinis.ai.enabled=false → controllers нет →
  endpoints 404 → frontend hides AI buttons automatically.

## Frontend
- `useAiFeatureAvailable` query — probes /ai/info, cache 5 min
- `useAiSuggestField` mutation — 30s timeout (LLM может быть slow)
- `AiFieldSuggestPanel` component — inline expandable: prompt → preview →
  accept/retry/reject. Error handling per HTTP status (503/429/422/502/404).
- DictionaryEditorDialog: AI toggle visible на schema tab когда
  aiAvailable=true. Accept wraps suggestion в mini-schema → parseSchemaJson
  (reuse existing kind-inference) → push в properties (overwrite если
  duplicate fieldName).
- i18n RU + EN

## Config
- application.yml: ordinis.ai.{enabled,endpoint,model,bearer-token,
  timeout-seconds}
- Helm writer.yaml: ORDINIS_AI_* env vars, optional secretRef для bearer
- values.yaml: ai.{enabled,endpoint,model,timeoutSeconds,bearerTokenSecretRef}
  defaults disabled

Pair с infra MR — values-staging enables AI с vortex.nstart.cloud Ollama
serving qwen2.5:7b.

ordinis-admin-ui/src/api/client.ts

@@ -794,6 +794,15 @@ export type SchemaTemplateDetail = SchemaTemplateSummary & {
   schemaJson: unknown
 }
 
+/**
+ * AI Schema Assist suggest-field response. Shape должен matchить
+ * AiSchemaController output (parsed LLM JSON: {fieldName, schema}).
+ */
+export type AiFieldSuggestion = {
+  fieldName: string
+  schema: Record<string, unknown>
+}
+
 /**
  * Empty-state hint payload (read-api scheduled-summary). Подсчёт записей с
  * {@code validFrom > now AND validTo > now} в текущем scope view.