refactor(vscode): share autocomplete FIM model selection

[marius-kilocode]

What Problem This Solves

Notebook and chat autocomplete duplicate the same model fallback selection for Next Edit models.

Why This Change Was Made

Move the identical selector into the existing FIM module that both callers already import. Preserve the notebookModel and getChatAutocompleteModel exports through aliases. Model catalogs, settings, credentials, request routing, and streaming are unchanged.

User Impact

No behavior change is intended. Next Edit models still use their configured FIM fallback; FIM selections still return the same model object. The PR removes 7 net production lines across three files, with no new files or test changes.

Evidence

• 21 existing selector and chat autocomplete tests pass, including gateway/direct-provider Next Edit fallback and FIM passthrough.
• Host/webview typecheck, lint, knip, build:check, formatting, duplication guard, and diff checks pass.
• Duplication report unchanged at 27 pairs, 521 lines, 3646 tokens. This five-line duplicate is below the scanner threshold; no allowlist changes were made.
• The pure selector is covered by existing tests. No model requests or manual UI session were needed.

No changeset is needed for this internal behavior-preserving refactor.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• packages/kilo-vscode/src/services/autocomplete/AutocompleteServiceManager.ts
• packages/kilo-vscode/src/services/autocomplete/chat-autocomplete/ChatTextAreaAutocomplete.ts
• packages/kilo-vscode/src/services/autocomplete/fim.ts

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_{Review guidance: REVIEW.md from base branch main}