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>

task.txt

@@ -1 +1,41 @@
-Refrence item model'ga "assessment_task_type" kategoriya qo'shish kerak
+object_type => Bu hozirda select. O’shanga value qo’shish kerak: bus, moto
+
+
+
+car_position => Qo’shish kerak. Bu hozirda select. /api/v1/reference-item/ api’dan value yuboraman
+
+
+
+distance_covered => Qo’shish kerak. Number. Bosib o’tilgan masofasi
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+
+
+body_type => Qo’shish kerak. Bu hozirda select. /api/v1/reference-item/ api’dan value yuboraman
+
+
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+fuel_type => Qo’shish kerak. Bu hozirda select. /api/v1/reference-item/ api’dan value yuboraman
+
+
+
+state_car => Qo’shish kerak. Bu hozirda select. /api/v1/reference-item/ api’dan value yuboraman
+
+
+
+car_type => manashu field ni olib tashlash kerak
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+
+
+tex_passport_file => multiple qilish kerak
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+
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+assessment_task_type => Baholash vazifasi. Qo’shish kerak. Select bo’ladi. /api/v1/reference-item/ api’dan value yuboraman
+
+
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+object_owner_residence => Obyekt egasi yashash joyi. Qo’shish kerak. string bo’ladi.
+
+
+
+manashu fieldlarni detail apidagi serializerga qoshish kerak auto-evaluationda ham va mechnic-auto-evaluationda ham