refactor: standardize AI acronym to Ai (PascalCase) across internal identifiers (#19837)

## Summary

The "AI" acronym was rendered inconsistently across the codebase. The
backend AI module had settled on PascalCase `Ai` (`AiAgentModule`,
`AiBillingService`, `AiChatModule`, `AiModelRegistryService`, etc.),
while frontend components, several DTOs, a few types, and shared
identifiers still used all-caps `AI` (`AIChatTab`,
`AISystemPromptPreviewDTO`, `SettingsPath.AIPrompts`, ...). CLAUDE.md
specifies PascalCase for classes; this PR normalizes everything internal
to `Ai`.

**This is a pure internal rename.** The GraphQL schema is untouched —
`@ObjectType` decorator string arguments, resolver method names (which
become Query/Mutation field names), gql template contents, and the
`generated-metadata/graphql.ts` file are preserved verbatim. The only
visible change is TypeScript identifiers and file names.

## Also folded in (adjacent cleanups)

- **`AgentModelConfigService` → `AiModelConfigService`**. Lives in
`ai-models/` and is used by multiple AI code paths, not just the Agent
entity. The "Agent" prefix was misleading.
- **`generate-text-input.dto.ts` → `generate-text.input.ts`**. The
`ai-agent/dtos/` folder already uses `<entity>.input.ts` convention for
Input classes (`create-agent.input.ts` etc.); the old path mixed
`.dto.ts` file extension with a class that has no DTO suffix. File
rename only; class stays `GenerateTextInput`.
- **Removed stale TODO** in `ai-model-config.type.ts` that asked for the
`AiModelConfig` rename that this PR performs.

## Rename methodology

Bulk rename via perl with anchored regex
`(?<!['"])(?<![A-Z.])AI([A-Z])(?=[a-z])/Ai$1/g`:

- **Lookbehind for non-uppercase** skips adjacent acronyms (`MOSAIC`,
`OIDCSSO`) and leaves `AIRBNB_ID` alone.
- **Lookbehind for non-quote** protects most string literals.
- **Lookahead for lowercase** restricts matches to PascalCase
identifiers (`AIChatTab`), leaving SCREAMING_SNAKE constants untouched.

Strict file-scope exclusions: `generated-metadata/**`, `generated/**`,
`locales/**`, `migrations/**`, `illustrations/**`, `halftone/**`, and
the two gql template files (`queries/getAISystemPromptPreview.ts`,
`mutations/uploadAIChatFile.ts`).

Post-rename reverts for identifiers where the regex was too eager:
- Backend resolver method names kept: `getAISystemPromptPreview`,
`uploadAIChatFile` (they are GraphQL field names).
- `@ObjectType('AdminAIModels')` / `('AISystemPromptPreview')` /
`('AISystemPromptSection')` kept as-is.
- Backend classes `ClientAIModelConfig` / `AdminAIModelConfig` kept
as-is (they use `@ObjectType()` with no argument, so the class name IS
the schema name).
- External-library symbols restored: `OpenAIProvider`,
`createOpenAICompatible`, `vercelAIIntegration`.

File renames use a two-step rename to work on macOS case-insensitive
filesystems: `git mv X.tsx X.tsx.tmp && git mv X.tsx.tmp renamed.tsx`.

## Diff audit

- 0 changes to migrations
- 0 changes to locale `.po` / `.ts` files
- 0 changes to `generated-metadata/graphql.ts`
- 0 changes to website illustration files (base64 blobs preserved)
- 0 renames inside user-facing translation strings (`t\`…\``,
`msg\`…\``, `<Trans>…</Trans>`)

## Test plan

- [x] `npx nx typecheck twenty-server` — PASS
- [x] `npx nx typecheck twenty-front` — PASS
- [x] `npx jest ai-model admin agent-role` — 79/79 PASS
- [x] `npx oxlint --type-aware` on 118 changed files — 0 errors
- [x] `npx prettier --check` on 118 changed files — clean
- [ ] CI

packages/twenty-front/src/modules/command-menu/hooks/useCommandMenuHotKeys.ts

@@ -1,6 +1,6 @@
 import { useKeyboardShortcutMenu } from '@/keyboard-shortcut-menu/hooks/useKeyboardShortcutMenu';
 import { SIDE_PANEL_FOCUS_ID } from '@/side-panel/constants/SidePanelFocusId';
-import { useOpenAskAIPageInSidePanel } from '@/side-panel/hooks/useOpenAskAIPageInSidePanel';
+import { useOpenAskAiPageInSidePanel } from '@/side-panel/hooks/useOpenAskAiPageInSidePanel';
 import { useOpenRecordsSearchPageInSidePanel } from '@/side-panel/hooks/useOpenRecordsSearchPageInSidePanel';
 import { useSidePanelHistory } from '@/side-panel/hooks/useSidePanelHistory';
 import { useSidePanelMenu } from '@/side-panel/hooks/useSidePanelMenu';
@@ -20,7 +20,7 @@ export const useCommandMenuHotKeys = () => {
 
   const { openRecordsSearchPage } = useOpenRecordsSearchPageInSidePanel();
 
-  const { openAskAIPage } = useOpenAskAIPageInSidePanel();
+  const { openAskAiPage } = useOpenAskAiPageInSidePanel();
 
   const { goBackFromSidePanel, goBackOneSubPageOrMainPage } =
     useSidePanelHistory();
@@ -59,11 +59,11 @@ export const useCommandMenuHotKeys = () => {
     keys: ['@'],
     callback: () => {
       if (isAiEnabled) {
-        openAskAIPage({ resetNavigationStack: true });
+        openAskAiPage({ resetNavigationStack: true });
       }
     },
     containsModifier: false,
-    dependencies: [openAskAIPage, isAiEnabled],
+    dependencies: [openAskAiPage, isAiEnabled],
     options: {
       ignoreModifiers: true,
     },