fix(01): calendar slot merge in OutputReview for PN/Schwartz badges

GenerateResponse now includes calendar field from backend.
OutputReview merges CalendarSlot into PostResult via slot_index,
enabling BadgePN, BadgeSchwartz rendering and Retry button.

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

backend/schemas/generate.py

@@ -10,7 +10,7 @@ from typing import Literal, Optional
 
 from pydantic import BaseModel, Field
 
-from backend.schemas.calendar import CalendarSlot
+from backend.schemas.calendar import CalendarResponse, CalendarSlot
 
 
 # ---------------------------------------------------------------------------
@@ -185,3 +185,7 @@ class GenerateResponse(BaseModel):
         ge=0,
         description="Numero di post falliti — esclusi dal CSV export",
     )
+    calendar: Optional[CalendarResponse] = Field(
+        default=None,
+        description="Calendario con gli slot originali — usato dal frontend per badge PN/Schwartz",
+    )

backend/services/generation_pipeline.py

@@ -198,6 +198,7 @@ class GenerationPipeline:
             total=status.total,
             success_count=success_count,
             failed_count=failed_count,
+            calendar=status.calendar,
         )
 
     def generate_single(