Update VectorSearchService and appsettings.json

- Clarified comment in `ChatService.cs`.
- Added `TokenizerService` and `ILogger` parameters to `VectorSearchService` constructor.
- Updated paragraph splitting to use `tokenizerService.CountTokens`.
- Added logging for token count of each paragraph in `VectorSearchService`.
- Updated `ModelId` comment in `appsettings.json` to include "gpt-4o-mini".
- Changed `MaxTokensPerParagraph` in `appsettings.json` from 1024 to 1000.

SqlDatabaseVectorSearch/appsettings.json

@@ -6,7 +6,7 @@
         "ChatCompletion": {
             "Endpoint": "",
             "Deployment": "",
-            "ModelId": "", // o1, gpt-4o, gpt-4, gpt-3.5 
+            "ModelId": "", // o1, gpt-4o, gpt-4o-mini, gpt-4, gpt-3.5 
             "ApiKey": ""
         },
         "Embedding": {
@@ -20,8 +20,8 @@
         }
     },
     "AppSettings": {
-        "MaxTokenPerLine": 300,
-        "MaxTokensPerParagraph": 1024,
+        "MaxTokensPerLine": 300,
+        "MaxTokensPerParagraph": 1000,
         "OverlapTokens": 100,
         "MaxRelevantChunks": 10,
         "MaxInputTokens": 16385,