feat(T02): vehicle management + mobile.de push + vehicle UI

- Vehicle model: 25+ fields, 5 vehicle types, soft-delete
- Vehicle CRUD: 7 API endpoints with JWT auth, filter/sort/paginate
- mobile.de: push/update/delete listings, field mapping, retry logic
- MobileDeListing model for sync status tracking
- Frontend: VehicleList, VehicleForm, VehicleDetail, MobileDeStatus
- 73 backend tests (82% coverage), 16 frontend tests

backend/app/schemas/vehicle.py

@@ -0,0 +1,147 @@
+"""Pydantic schemas for vehicle-related request and response bodies."""
+
+import uuid
+from datetime import date, datetime
+from decimal import Decimal
+from typing import Literal, Optional
+
+from pydantic import BaseModel, ConfigDict, Field, field_validator, model_validator
+
+
+VEHICLE_TYPES = Literal["lkw", "pkw", "baumaschine", "stapler", "transporter"]
+CONDITIONS = Literal["new", "used"]
+AVAILABILITY = Literal["available", "reserved", "sold"]
+HOURS_UNITS = Literal["h", "min"]
+
+
+class VehicleBase(BaseModel):
+    """Base vehicle fields shared across schemas."""
+
+    make: str = Field(..., min_length=1, max_length=100)
+    model: str = Field(..., min_length=1, max_length=100)
+    fin: str = Field(..., min_length=17, max_length=17)
+    year: Optional[int] = Field(None, ge=1900, le=2100)
+    first_registration: Optional[date] = None
+    power_kw: Optional[int] = Field(None, ge=0)
+    power_hp: Optional[int] = Field(None, ge=0)
+    fuel_type: Optional[str] = Field(None, max_length=50)
+    transmission: Optional[str] = Field(None, max_length=20)
+    color: Optional[str] = Field(None, max_length=50)
+    condition: CONDITIONS = "used"
+    location: Optional[str] = Field(None, max_length=255)
+    availability: AVAILABILITY = "available"
+    price: Decimal = Field(..., ge=0)
+    vehicle_type: VEHICLE_TYPES
+    lkw_type: Optional[str] = Field(None, max_length=50)
+    machine_type: Optional[str] = Field(None, max_length=50)
+    body_type: Optional[str] = Field(None, max_length=100)
+    operating_hours: Optional[Decimal] = Field(None, ge=0)
+    operating_hours_unit: Optional[HOURS_UNITS] = None
+    mileage_km: Optional[int] = Field(None, ge=0)
+    description: Optional[str] = None
+
+    @model_validator(mode="after")
+    def compute_power_hp(self) -> "VehicleBase":
+        """Auto-compute power_hp from power_kw if not provided."""
+        if self.power_kw is not None and self.power_hp is None:
+            self.power_hp = round(self.power_kw * 1.35962)
+        return self
+
+
+class VehicleCreate(VehicleBase):
+    """POST /api/v1/vehicles request body."""
+    pass
+
+
+class VehicleUpdate(BaseModel):
+    """PUT /api/v1/vehicles/:id request body (all fields optional)."""
+
+    make: Optional[str] = Field(None, min_length=1, max_length=100)
+    model: Optional[str] = Field(None, min_length=1, max_length=100)
+    fin: Optional[str] = Field(None, min_length=17, max_length=17)
+    year: Optional[int] = Field(None, ge=1900, le=2100)
+    first_registration: Optional[date] = None
+    power_kw: Optional[int] = Field(None, ge=0)
+    power_hp: Optional[int] = Field(None, ge=0)
+    fuel_type: Optional[str] = Field(None, max_length=50)
+    transmission: Optional[str] = Field(None, max_length=20)
+    color: Optional[str] = Field(None, max_length=50)
+    condition: Optional[CONDITIONS] = None
+    location: Optional[str] = Field(None, max_length=255)
+    availability: Optional[AVAILABILITY] = None
+    price: Optional[Decimal] = Field(None, ge=0)
+    vehicle_type: Optional[VEHICLE_TYPES] = None
+    lkw_type: Optional[str] = Field(None, max_length=50)
+    machine_type: Optional[str] = Field(None, max_length=50)
+    body_type: Optional[str] = Field(None, max_length=100)
+    operating_hours: Optional[Decimal] = Field(None, ge=0)
+    operating_hours_unit: Optional[HOURS_UNITS] = None
+    mileage_km: Optional[int] = Field(None, ge=0)
+    description: Optional[str] = None
+
+    @model_validator(mode="after")
+    def compute_power_hp(self) -> "VehicleUpdate":
+        """Auto-compute power_hp from power_kw if not provided."""
+        if self.power_kw is not None and self.power_hp is None:
+            self.power_hp = round(self.power_kw * 1.35962)
+        return self
+
+
+class VehicleResponse(BaseModel):
+    """Vehicle response schema."""
+
+    model_config = ConfigDict(from_attributes=True)
+
+    id: uuid.UUID
+    make: str
+    model: str
+    fin: str
+    year: Optional[int] = None
+    first_registration: Optional[date] = None
+    power_kw: Optional[int] = None
+    power_hp: Optional[int] = None
+    fuel_type: Optional[str] = None
+    transmission: Optional[str] = None
+    color: Optional[str] = None
+    condition: str
+    location: Optional[str] = None
+    availability: str
+    price: Decimal
+    vehicle_type: str
+    lkw_type: Optional[str] = None
+    machine_type: Optional[str] = None
+    body_type: Optional[str] = None
+    operating_hours: Optional[Decimal] = None
+    operating_hours_unit: Optional[str] = None
+    mileage_km: Optional[int] = None
+    description: Optional[str] = None
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+    deleted_at: Optional[datetime] = None
+
+
+class VehicleListResponse(BaseModel):
+    """Paginated vehicle list response."""
+
+    items: list[VehicleResponse]
+    total: int
+    page: int
+    page_size: int
+
+
+class MobileDeStatusResponse(BaseModel):
+    """mobile.de sync status for a vehicle."""
+
+    synced: bool
+    ad_id: Optional[str] = None
+    synced_at: Optional[datetime] = None
+    sync_status: str = "pending"
+    error_log: Optional[str] = None
+
+
+class MobileDePushResponse(BaseModel):
+    """Response for mobile.de push request."""
+
+    message: str = "Push queued"
+    vehicle_id: uuid.UUID
+    listing_id: Optional[uuid.UUID] = None