feat: replace hardcoded AI model constants with JSON seed catalog (#18818)

## Summary

- Replaces per-provider TypeScript constant files
(`openai-models.const.ts`, `anthropic-models.const.ts`, etc.) with a
single `ai-providers.json` catalog as the source of truth
- Adds runtime model discovery via AI SDK for self-hosted providers,
with `models.dev` enrichment for pricing/capabilities
- Introduces composite model IDs (`provider/modelId`) for canonical,
conflict-free identification
- Simplifies provider configuration: API keys are injected from
environment variables (e.g., `OPENAI_API_KEY`)
- Adds admin panel UI for provider management (add/remove/test), model
discovery, recommended model configuration, and default fast/smart model
selection per workspace
- Removes deprecated config variables (`AI_DISABLED_MODEL_IDS`,
`AUTO_ENABLE_NEW_AI_MODELS`, etc.)
- Adds database migration for composite model ID format

## Test plan

- [ ] Server typecheck passes
- [ ] Frontend typecheck passes
- [ ] Server unit tests pass
- [ ] Frontend unit tests pass
- [ ] CI pipeline green
- [ ] Admin panel AI tab loads correctly
- [ ] Provider discovery works for configured providers
- [ ] Model recommendation toggles persist
- [ ] Default fast/smart model selection works


Made with [Cursor](https://cursor.com)

packages/twenty-server/src/engine/core-modules/application/utils/from-agent-manifest-to-universal-flat-agent.util.ts

@@ -1,9 +1,7 @@
 import { type AgentManifest } from 'twenty-shared/application';
 
-import {
-  DEFAULT_SMART_MODEL,
-  type ModelId,
-} from 'src/engine/metadata-modules/ai/ai-models/constants/ai-models.const';
+import { DEFAULT_SMART_MODEL } from 'src/engine/metadata-modules/ai/ai-models/types/default-smart-model.const';
+import { type ModelId } from 'src/engine/metadata-modules/ai/ai-models/types/model-id.type';
 import { type UniversalFlatAgent } from 'src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/universal-flat-agent.type';
 
 export const fromAgentManifestToUniversalFlatAgent = ({