feat(v2): seed scenario napoli-sas-multi + main include routers

A7 scripts/seed_sandbox.py:
- ensure_assigned_application() popola gepafin_schema.assigned_applications
- scenario napoli-sas-multi: tranche 1 APPROVED + tranche 2 DRAFT vuota
  Tranche 1 caso reale Cecilia: 1 fattura B3 524.50 EUR con rettifica 57.36 EUR
  (storno assicurazione), ammesso 467.14 EUR. 1 ULA T_IND AMMESSA.
  4 documenti VALIDO. 2 custom_checks VALIDO (antiriciclaggio + polizza con PDF).
  Tranche 2 DRAFT: assigned_instructor_id=NULL (simula workflow capo)
- TRUNCATE include remission_custom_check_value (CASCADE gia la gestiva)

main.py: include router custom_checks + assignment, version bump 0.4.0

Test: seed --reset --scenario=napoli-sas-multi -> 2 tranche create in 6s,
PDF polizza 10KB generato in custom_checks/<T1>/polizza_fidejussoria/.

app/main.py

@@ -15,7 +15,7 @@ from sqlalchemy import text
 from .config import get_settings
 from .db import engine, Base
 from .migrations import run_migrations
-from .routers import health, schemas, practices, debug, instructor, files, verbale
+from .routers import health, schemas, practices, debug, instructor, files, verbale, custom_checks, assignment
 
 logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(name)s: %(message)s")
 log = logging.getLogger("rendicontazione-api")
@@ -42,7 +42,7 @@ async def lifespan(app: FastAPI):
 app = FastAPI(
     title="rendicontazione-api",
     description="Microservizio rendicontazione per Gepafin — sviluppato da BFLOWS",
-    version="0.3.0",
+    version="0.4.0",
     lifespan=lifespan,
 )
 
@@ -61,13 +61,15 @@ app.include_router(debug.router)
 app.include_router(instructor.router)
 app.include_router(files.router)
 app.include_router(verbale.router)
+app.include_router(custom_checks.router)
+app.include_router(assignment.router)
 
 
 @app.get("/", tags=["root"])
 def root():
     return {
         "service": "rendicontazione-api",
-        "version": "0.3.0",
+        "version": "0.4.0",
         "docs": "/docs",
         "health": "/health",
     }