feat: wire contract PDF context and align MechanicAuto with AutoEvaluation

- contract PDF: map report/customer/owner/contract from AutoEvaluationModel
  fields, accept inspection via POST serializer, fetch CBU.uz currency rates
- MechanicAutoEvaluation: add distance_covered, object_owner_residence and
  car_position/body_type/fuel_type/state_car/assessment_task_type FKs; drop
  car_type and single tex_passport_file in favour of multi-file FK model

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

core/apps/evaluation/models/mechanic_auto.py

@@ -4,7 +4,6 @@ from django_core.models import AbstractBaseModel
 from model_bakery import baker
 
 from core.apps.evaluation.choices.auto import (
-    AutoCarType,
     AutoCarWheel,
     AutoEvaluationStatus,
     AutoObjectType,
@@ -50,12 +49,57 @@ class MechanicAutoEvaluationModel(AbstractBaseModel):
         blank=True,
     )
 
-    tex_passport_file = models.FileField(
-        verbose_name=_("tech passport file"),
-        upload_to="mechanic_evaluation/tech_passports/%Y/%m/",
+    distance_covered = models.PositiveIntegerField(
+        verbose_name=_("distance covered"),
         blank=True,
         null=True,
     )
+    object_owner_residence = models.CharField(
+        verbose_name=_("object owner residence"),
+        max_length=255,
+        blank=True,
+        null=True,
+    )
+    car_position = models.ForeignKey(
+        'evaluation.ReferenceitemModel',
+        verbose_name=_("car position"),
+        blank=True,
+        null=True,
+        on_delete=models.SET_NULL,
+        related_name='evaluation_mechanic_auto_car_position',
+    )
+    body_type = models.ForeignKey(
+        'evaluation.ReferenceitemModel',
+        verbose_name=_("body type"),
+        blank=True,
+        null=True,
+        on_delete=models.SET_NULL,
+        related_name='evaluation_mechanic_auto_body_type',
+    )
+    fuel_type = models.ForeignKey(
+        'evaluation.ReferenceitemModel',
+        verbose_name=_("fuel type"),
+        blank=True,
+        null=True,
+        on_delete=models.SET_NULL,
+        related_name='evaluation_mechanic_auto_fuel_type',
+    )
+    state_car = models.ForeignKey(
+        'evaluation.ReferenceitemModel',
+        verbose_name=_("state car"),
+        blank=True,
+        null=True,
+        on_delete=models.SET_NULL,
+        related_name='evaluation_mechanic_auto_state_car',
+    )
+    assessment_task_type = models.ForeignKey(
+        'evaluation.ReferenceitemModel',
+        verbose_name=_("assessment task type"),
+        blank=True,
+        null=True,
+        on_delete=models.SET_NULL,
+        related_name='evaluation_mechanic_auto_assessment_task_type',
+    )
 
     # ── Step 1 — Umumiy ma'lumotlar ──────────────────────────────────
     registration_number = models.CharField(
@@ -170,12 +214,6 @@ class MechanicAutoEvaluationModel(AbstractBaseModel):
         blank=True,
         null=True,
     )
-    car_type = models.IntegerField(
-        verbose_name=_("car type"),
-        choices=AutoCarType.choices,
-        blank=True,
-        null=True,
-    )
     car_wheel = models.IntegerField(
         verbose_name=_("car wheel"),
         choices=AutoCarWheel.choices,
@@ -248,3 +286,27 @@ class MechanicAutoEvaluationModel(AbstractBaseModel):
         db_table = "MechanicAutoEvaluation"
         verbose_name = _("Mechanic Auto Evaluation")
         verbose_name_plural = _("Mechanic Auto Evaluations")
+
+
+class MechanicAutoEvaluationTexPassportFile(AbstractBaseModel):
+    mechanic_auto_evaluation = models.ForeignKey(
+        MechanicAutoEvaluationModel,
+        on_delete=models.CASCADE,
+        related_name="tex_passport_files",
+    )
+    file = models.FileField(
+        verbose_name=_("tech passport file"),
+        upload_to="mechanic_evaluation/tech_passports/%Y/%m/",
+    )
+
+    def __str__(self):
+        return f"Tex passport file for MechanicAutoEvaluation #{self.mechanic_auto_evaluation_id}"
+
+    @classmethod
+    def _baker(cls):
+        return baker.make(cls)
+
+    class Meta:
+        db_table = "MechanicAutoEvaluationTexPassportFile"
+        verbose_name = _("Mechanic Auto Evaluation Tex Passport File")
+        verbose_name_plural = _("Mechanic Auto Evaluation Tex Passport Files")