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>

backend/main.py

@@ -10,6 +10,7 @@ from fastmcp.utilities.lifespan import combine_lifespans  # noqa: E402
 
 from db import create_db_and_tables  # noqa: E402
 from innercontext.api import (  # noqa: E402
+    ai_logs,
     health,
     inventory,
     products,
@@ -45,6 +46,7 @@ app.include_router(inventory.router, prefix="/inventory", tags=["inventory"])
 app.include_router(health.router, prefix="/health", tags=["health"])
 app.include_router(routines.router, prefix="/routines", tags=["routines"])
 app.include_router(skincare.router, prefix="/skincare", tags=["skincare"])
+app.include_router(ai_logs.router, prefix="/ai-logs", tags=["ai-logs"])
 
 
 app.mount("/mcp", mcp_app)