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>

frontend/public/locales/en/translation.json

@@ -42,7 +42,7 @@
   },
   "dashboard": {
     "welcome": "Welcome, {{name}}",
-    "subtitle": "Your personal AI health assistant"
+    "subtitle": "Your personal AI assistant"
   },
   "chat": {
     "new_chat": "New Chat",
@@ -116,10 +116,10 @@
     "clear_search": "Clear",
     "types": {
       "other": "Other",
-      "lab_result": "Lab Result",
-      "consultation": "Consultation",
-      "prescription": "Prescription",
-      "imaging": "Imaging"
+      "report": "Report",
+      "contract": "Contract",
+      "receipt": "Receipt",
+      "certificate": "Certificate"
     },
     "status": {
       "pending": "Pending",
@@ -131,7 +131,7 @@
   "memory": {
     "create": "Add Memory Entry",
     "edit": "Edit Memory Entry",
-    "no_entries": "No memory entries yet. The AI will save important health information here.",
+    "no_entries": "No memory entries yet. The AI will save important information here.",
     "category": "Category",
     "importance": "Importance",
     "title_field": "Title",
@@ -139,10 +139,10 @@
     "content_field": "Content",
     "content_placeholder": "Detailed information...",
     "categories": {
-      "condition": "Condition",
-      "medication": "Medication",
-      "allergy": "Allergy",
-      "vital": "Vital Sign",
+      "health": "Health",
+      "finance": "Finance",
+      "personal": "Personal",
+      "work": "Work",
       "document_summary": "Document Summary",
       "other": "Other"
     },