write prompts for genai at the camera level (#13767)

docs/docs/configuration/reference.md

@@ -504,7 +504,7 @@ semantic_search:
 # to Google or OpenAI's LLMs to generate descriptions. It can be overridden at
 # the camera level (enabled: False) to enhance privacy for indoor cameras.
 genai:
-  # Optional: Enable Google Gemini description generation (default: shown below)
+  # Optional: Enable AI description generation (default: shown below)
   enabled: False
   # Required if enabled: Provider must be one of ollama, gemini, or openai
   provider: ollama
@@ -712,6 +712,18 @@ cameras:
       # By default the cameras are sorted alphabetically.
       order: 0
 
+    # Optional: Configuration for AI generated tracked object descriptions
+    genai:
+      # Optional: Enable AI description generation (default: shown below)
+      enabled: False
+      # Optional: The default prompt for generating descriptions. Can use replacement
+      # variables like "label", "sub_label", "camera" to make more dynamic. (default: shown below)
+      prompt: "Describe the {label} in the sequence of images with as much detail as possible. Do not describe the background."
+      # Optional: Object specific prompts to customize description results
+      # Format: {label}: {prompt}
+      object_prompts:
+        person: "My special person prompt."
+
 # Optional
 ui:
   # Optional: Set a timezone to use in the UI (default: use browser local time)