feat(skills): update Pydantic model configuration to use ConfigDict for validation

backend/app/schemas/skills_marketplace.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 from datetime import datetime
 from uuid import UUID
 
-from pydantic import AnyHttpUrl
+from pydantic import AnyHttpUrl, ConfigDict
 from sqlmodel import Field, SQLModel
 
 from app.schemas.common import NonEmptyStr
@@ -30,8 +30,7 @@ class SkillPackCreate(SQLModel):
     branch: str = "main"
     metadata_: dict[str, object] = Field(default_factory=dict, alias="metadata")
 
-    class Config:
-        validate_by_name = True
+    model_config = ConfigDict(validate_by_name=True)
 
 
 class MarketplaceSkillRead(SQLModel):
@@ -47,8 +46,7 @@ class MarketplaceSkillRead(SQLModel):
     source_url: str
     metadata_: dict[str, object] = Field(default_factory=dict, alias="metadata")
 
-    class Config:
-        validate_by_name = True
+    model_config = ConfigDict(validate_by_name=True)
 
     created_at: datetime
     updated_at: datetime
@@ -65,8 +63,7 @@ class SkillPackRead(SQLModel):
     branch: str
     metadata_: dict[str, object] = Field(default_factory=dict, alias="metadata")
 
-    class Config:
-        validate_by_name = True
+    model_config = ConfigDict(validate_by_name=True)
 
     skill_count: int = 0
     created_at: datetime