fix: respect user-configured dimensions setting in file index

- Remove hardcoded 1536 dimension fallback in ClineProvider.ts line 1545
- Allow proper dimension resolution through service factory hierarchy:
  1. User configuration (modelDimension)
  2. Model-specific defaults (getModelDimension)
  3. System defaults
- Fixes issue where RooCode ignored dimensions setting and caused
  "Vector dimension error: expected dim: 1536, got 1024" in Qdrant

Fixes #5754

Author: roomote

src/core/webview/ClineProvider.ts

@@ -1542,7 +1542,7 @@ export class ClineProvider
 				codebaseIndexEmbedderProvider: codebaseIndexConfig?.codebaseIndexEmbedderProvider ?? "openai",
 				codebaseIndexEmbedderBaseUrl: codebaseIndexConfig?.codebaseIndexEmbedderBaseUrl ?? "",
 				codebaseIndexEmbedderModelId: codebaseIndexConfig?.codebaseIndexEmbedderModelId ?? "",
-				codebaseIndexEmbedderModelDimension: codebaseIndexConfig?.codebaseIndexEmbedderModelDimension ?? 1536,
+				codebaseIndexEmbedderModelDimension: codebaseIndexConfig?.codebaseIndexEmbedderModelDimension,
 				codebaseIndexOpenAiCompatibleBaseUrl: codebaseIndexConfig?.codebaseIndexOpenAiCompatibleBaseUrl,
 				codebaseIndexSearchMaxResults: codebaseIndexConfig?.codebaseIndexSearchMaxResults,
 				codebaseIndexSearchMinScore: codebaseIndexConfig?.codebaseIndexSearchMinScore,