feat(quality): complete bounded resolution flows and typed snapshots

Two real gaps here: related-entity snapshots were typed by inferring from
the issue's rule_type (get_issue always resolved related refs as "customer"
for duplicates and "vehicle" for everything else), so a booking_overlap
issue's related bookings silently failed to resolve; and defer/reject were
the only resolution actions for 4 of 5 rule types, leaving
missing_required_field, odometer_regression, booking_overlap and
vehicle_status_conflict with no real path beyond a generic reject.

Type related entities from their own public-reference prefix (CUS-/MO-/
BK-/INSP-) instead of the issue's rule_type, and add typed snapshots for
booking and inspection. Add one bounded resolution endpoint per remaining
rule type: provide-fields (re-runs the missing-field check, resolves only
once nothing required is missing), resolve-odometer-regression (retain
canonical or correct the reading -- never silently lowers canonical
mileage), resolve-overlap (blocks one of the two bookings, re-verifies no
overlap remains), apply-recommended-status (one authoritative
recommendation function shared with re-validation). Manual scan now takes
an actor and audits data_quality_scan_run. Reintroduced evidence after a
non-open decision links the new issue back to the prior one
(evidence.reopened_from / previous_decision) instead of looking like a
fresh, undecided problem.

backend/app/schemas.py

@@ -141,6 +141,28 @@ class ScanResultOut(BaseModel):
     created: dict[str, int]
 
 
+class ProvideFieldsRequest(BaseModel):
+    fields: dict[str, str]
+
+
+class ResolveOdometerRegressionRequest(BaseModel):
+    decision: Literal["retain_canonical", "correct_reading"]
+    booking_ref: str | None = None
+    corrected_odometer_km: Annotated[int, Field(ge=0)] | None = None
+    note: str | None = Field(default=None, max_length=500)
+
+
+class ResolveOverlapRequest(BaseModel):
+    booking_ref: str
+    note: str | None = Field(default=None, max_length=500)
+
+
+class ApplyRecommendedStatusResult(BaseModel):
+    issue: DataQualityIssueOut
+    applied_status: str
+    reason: str
+
+
 class VehicleDetailOut(VehicleOut):
     bookings: list[BookingSummaryOut] = Field(default_factory=list)
     inspections: list[InspectionOut] = Field(default_factory=list)