Move prompts to separate files and add prompt types

- Created directory structure for prompts (system and user prompts)
- Added specialized prompts for lectures, meetings, and interviews
- Updated enhancer.py to load prompts from files
- Added --prompt-type CLI parameter to select prompt type
- Updated documentation and enhancement proposals

enhancement_proposals.md

@@ -9,9 +9,11 @@ This document outlines proposed improvements for the mknotes software, grouped b
   - Extend support to include additional formats like FLAC, OGG, etc.
   - ✅ Updated the `find_audio_files` function in `utils.py` to recognize WAV extension
 
-- **Customizable Enhancement Prompts**
-  - Allow users to provide their own prompts via CLI arguments or configuration files.
-  - Increase flexibility for different use cases (e.g., meeting notes, lectures, interviews).
+- **Customizable Enhancement Prompts** ✅ (Implemented)
+  - ✅ Added CLI argument to select different prompt types (lecture, meeting, interview)
+  - ✅ Moved prompts to separate files for easier customization
+  - ✅ Created specialized prompts for different use cases (lectures, meeting minutes, interviews)
+  - Allow users to provide their own custom prompts via configuration files.
 
 - **Batch Processing Controls**
   - Add the ability to limit the number of files processed in one run.
@@ -51,8 +53,8 @@ This document outlines proposed improvements for the mknotes software, grouped b
 
 ## Code Structure Improvements
 
-- **Separation of Concerns**
-  - Move prompts to separate configuration files.
+- **Separation of Concerns** ✅ (Partially implemented)
+  - ✅ Moved prompts to separate files in a dedicated prompts directory.
   - Create a more abstract API client layer.
 
 - **Progress Tracking and Reporting**