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/ru/translation.json

@@ -42,7 +42,7 @@
   },
   "dashboard": {
     "welcome": "Добро пожаловать, {{name}}",
-    "subtitle": "Ваш персональный ИИ-ассистент по здоровью"
+    "subtitle": "Ваш персональный ИИ-ассистент"
   },
   "chat": {
     "new_chat": "Новый чат",
@@ -116,10 +116,10 @@
     "clear_search": "Очистить",
     "types": {
       "other": "Другое",
-      "lab_result": "Анализы",
-      "consultation": "Консультация",
-      "prescription": "Рецепт",
-      "imaging": "Снимки"
+      "report": "Отчёт",
+      "contract": "Договор",
+      "receipt": "Квитанция",
+      "certificate": "Сертификат"
     },
     "status": {
       "pending": "Ожидание",
@@ -131,7 +131,7 @@
   "memory": {
     "create": "Добавить запись",
     "edit": "Редактировать запись",
-    "no_entries": "Записей пока нет. ИИ будет сохранять важную информацию о здоровье здесь.",
+    "no_entries": "Записей пока нет. ИИ будет сохранять важную информацию здесь.",
     "category": "Категория",
     "importance": "Важность",
     "title_field": "Заголовок",
@@ -139,10 +139,10 @@
     "content_field": "Содержание",
     "content_placeholder": "Подробная информация...",
     "categories": {
-      "condition": "Заболевание",
-      "medication": "Лекарство",
-      "allergy": "Аллергия",
-      "vital": "Показатели",
+      "health": "Здоровье",
+      "finance": "Финансы",
+      "personal": "Личное",
+      "work": "Работа",
       "document_summary": "Сводка документа",
       "other": "Другое"
     },