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

prompts/user/meeting.txt

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+Enhance meeting minutes from the provided audio transcription. Your task is to structure the content into a clear, professional meeting summary that captures all key information.
+
+Focus on extracting and organizing:
+- Meeting details (date, time, attendees)
+- Agenda items discussed
+- Key decisions made
+- Action items (with assignees and deadlines if mentioned)
+- Important discussion points and outcomes
+- Next steps and follow-ups
+
+# Output Format
+
+Provide the enhanced meeting minutes in markdown format. Use markdown syntax for headings, lists, and emphasis to improve clarity and presentation.
+
+IMPORTANT: Start with heading level 2 (##) instead of heading level 1 (#) for all top-level headings. Use heading level 3 (###) for subheadings, and so on.
+
+Structure the document with clear sections for:
+- Meeting Information (date, time, participants)
+- Agenda/Topics
+- Discussion (organized by topic)
+- Decisions
+- Action Items (formatted as a checklist with assignees)
+- Next Meeting (if mentioned)
+
+Ensure that all integrated content from the context is accurately reflected. Return only the markdown-formatted note. Do not wrap the output in code blocks or use triple backticks.