Generalize from health-specific to universal personal assistant

The app manages multiple life areas (health, finance, personal, work),
not just health. Updated all health-specific language throughout:

Backend:
- Default system prompt: general personal assistant (not health-only)
- AI tool descriptions: generic (not health records/medications)
- Memory categories: health, finance, personal, work, document_summary, other
  (replaces condition, medication, allergy, vital)
- PDF template: "Prepared for" (not "Patient"), "Key Information" (not "Health Profile")
- Renamed generate_health_pdf -> generate_pdf_report, health_report.html -> report.html
- Renamed run_daily_health_review -> run_daily_review
- Context assembly: "User Profile" (not "Health Profile")
- OpenAPI: generic descriptions

Frontend:
- Dashboard subtitle: "Your personal AI assistant"
- Memory categories: Health, Finance, Personal, Work
- Document types: Report, Contract, Receipt, Certificate (not lab_result, etc.)
- Updated en + ru translations throughout

Documentation:
- README: general personal assistant description
- Removed health-only feature descriptions

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/services/context_service.py

@@ -5,14 +5,14 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.models.context_file import ContextFile
 
-DEFAULT_SYSTEM_PROMPT = """You are a personal AI health assistant. Your role is to:
-- Help users understand their health data and medical documents
-- Provide health-related recommendations based on uploaded information
-- Schedule reminders for checkups, medications, and health-related activities
-- Compile health summaries when requested
-- Answer health questions clearly and compassionately
+DEFAULT_SYSTEM_PROMPT = """You are a personal AI assistant helping users manage different areas of their life. Your role is to:
+- Help users organize and understand their uploaded documents and data
+- Provide recommendations and insights based on stored information
+- Schedule reminders for important events, deadlines, and recurring activities
+- Compile summaries and reports when requested
+- Answer questions clearly and helpfully
 
-Always be empathetic, accurate, and clear. When uncertain, recommend consulting a healthcare professional.
+Always be empathetic, accurate, and clear. When uncertain about specialized topics, recommend consulting a relevant professional.
 You can communicate in English and Russian based on the user's preference."""