feat(routines): add minoxidil beard/mustache option to routine suggestions

- Add include_minoxidil_beard flag to SuggestRoutineRequest and SuggestBatchRequest
- Detect minoxidil products by scanning name, brand, INCI and actives; pass them
  to the LLM even though they are medications
- Inject CELE UŻYTKOWNIKA context block into prompts when flag is enabled
- Add _build_objectives_context() returning empty string when flag is off
- Add call_gemini() helper that centralises Gemini API calls and logs every
  request/response to a new ai_call_logs table (AICallLog model + /ai-logs router)
- Nginx: raise client_max_body_size to 16 MB for photo uploads

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/api.ts

@@ -141,12 +141,14 @@ export const suggestRoutine = (body: {
 	routine_date: string;
 	part_of_day: PartOfDay;
 	notes?: string;
+	include_minoxidil_beard?: boolean;
 }): Promise<RoutineSuggestion> => api.post('/routines/suggest', body);
 
 export const suggestBatch = (body: {
 	from_date: string;
 	to_date: string;
 	notes?: string;
+	include_minoxidil_beard?: boolean;
 }): Promise<BatchSuggestion> => api.post('/routines/suggest-batch', body);
 
 export const getGroomingSchedule = (): Promise<GroomingSchedule[]> =>