style: apply black and isort formatting across entire codebase

- Standardize quote style (single to double quotes)
- Reorder and group imports alphabetically
- Fix line breaks and indentation for consistency
- Apply PEP 8 formatting standards

Also updated Makefile to exclude both venv and .venv from code quality checks.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

models/schema/vendor.py

@@ -15,7 +15,8 @@ Schemas include:
 
 import re
 from datetime import datetime
-from typing import Dict, List, Optional, Any
+from typing import Any, Dict, List, Optional
+
 from pydantic import BaseModel, ConfigDict, Field, field_validator
 
 
@@ -27,32 +28,26 @@ class VendorCreate(BaseModel):
         ...,
         description="Unique vendor identifier (e.g., TECHSTORE)",
         min_length=2,
-        max_length=50
+        max_length=50,
     )
     subdomain: str = Field(
-        ...,
-        description="Unique subdomain for the vendor",
-        min_length=2,
-        max_length=100
+        ..., description="Unique subdomain for the vendor", min_length=2, max_length=100
     )
     name: str = Field(
-        ...,
-        description="Display name of the vendor",
-        min_length=2,
-        max_length=255
+        ..., description="Display name of the vendor", min_length=2, max_length=255
     )
     description: Optional[str] = Field(None, description="Vendor description")
 
     # Owner Information (Creates User Account)
     owner_email: str = Field(
         ...,
-        description="Email for the vendor owner (used for login and authentication)"
+        description="Email for the vendor owner (used for login and authentication)",
     )
 
     # Business Contact Information (Vendor Fields)
     contact_email: Optional[str] = Field(
         None,
-        description="Public business contact email (defaults to owner_email if not provided)"
+        description="Public business contact email (defaults to owner_email if not provided)",
     )
     contact_phone: Optional[str] = Field(None, description="Contact phone number")
     website: Optional[str] = Field(None, description="Website URL")
@@ -78,8 +73,10 @@ class VendorCreate(BaseModel):
     @classmethod
     def validate_subdomain(cls, v):
         """Validate subdomain format: lowercase alphanumeric with hyphens."""
-        if v and not re.match(r'^[a-z0-9][a-z0-9-]*[a-z0-9]$', v):
-            raise ValueError("Subdomain must contain only lowercase letters, numbers, and hyphens")
+        if v and not re.match(r"^[a-z0-9][a-z0-9-]*[a-z0-9]$", v):
+            raise ValueError(
+                "Subdomain must contain only lowercase letters, numbers, and hyphens"
+            )
         return v.lower() if v else v
 
     @field_validator("vendor_code")
@@ -104,8 +101,7 @@ class VendorUpdate(BaseModel):
 
     # Business Contact Information (Vendor Fields)
     contact_email: Optional[str] = Field(
-        None,
-        description="Public business contact email"
+        None, description="Public business contact email"
     )
     contact_phone: Optional[str] = None
     website: Optional[str] = None
@@ -142,6 +138,7 @@ class VendorUpdate(BaseModel):
 
 class VendorResponse(BaseModel):
     """Standard schema for vendor response data."""
+
     model_config = ConfigDict(from_attributes=True)
 
     id: int
@@ -184,13 +181,9 @@ class VendorDetailResponse(VendorResponse):
     """
 
     owner_email: str = Field(
-        ...,
-        description="Email of the vendor owner (for login/authentication)"
-    )
-    owner_username: str = Field(
-        ...,
-        description="Username of the vendor owner"
+        ..., description="Email of the vendor owner (for login/authentication)"
     )
+    owner_username: str = Field(..., description="Username of the vendor owner")
 
 
 class VendorCreateResponse(VendorDetailResponse):
@@ -201,17 +194,14 @@ class VendorCreateResponse(VendorDetailResponse):
     """
 
     temporary_password: str = Field(
-        ...,
-        description="Temporary password for owner (SHOWN ONLY ONCE)"
-    )
-    login_url: Optional[str] = Field(
-        None,
-        description="URL for vendor owner to login"
+        ..., description="Temporary password for owner (SHOWN ONLY ONCE)"
     )
+    login_url: Optional[str] = Field(None, description="URL for vendor owner to login")
 
 
 class VendorListResponse(BaseModel):
     """Schema for paginated vendor list."""
+
     vendors: List[VendorResponse]
     total: int
     skip: int
@@ -220,6 +210,7 @@ class VendorListResponse(BaseModel):
 
 class VendorSummary(BaseModel):
     """Lightweight vendor summary for dropdowns and quick references."""
+
     model_config = ConfigDict(from_attributes=True)
 
     id: int
@@ -239,20 +230,17 @@ class VendorTransferOwnership(BaseModel):
     """
 
     new_owner_user_id: int = Field(
-        ...,
-        description="ID of the user who will become the new owner",
-        gt=0
+        ..., description="ID of the user who will become the new owner", gt=0
     )
 
     confirm_transfer: bool = Field(
-        ...,
-        description="Must be true to confirm ownership transfer"
+        ..., description="Must be true to confirm ownership transfer"
     )
 
     transfer_reason: Optional[str] = Field(
         None,
         max_length=500,
-        description="Reason for ownership transfer (for audit logs)"
+        description="Reason for ownership transfer (for audit logs)",
     )
 
     @field_validator("confirm_transfer")
@@ -273,12 +261,10 @@ class VendorTransferOwnershipResponse(BaseModel):
     vendor_name: str
 
     old_owner: Dict[str, Any] = Field(
-        ...,
-        description="Information about the previous owner"
+        ..., description="Information about the previous owner"
     )
     new_owner: Dict[str, Any] = Field(
-        ...,
-        description="Information about the new owner"
+        ..., description="Information about the new owner"
     )
 
     transferred_at: datetime