feat(app): expand GPU model and schema for richer hardware specs

Updates SQLModel + Pydantic shape for DiscreteGPU to expose the
additional fields populated by the rebuilt GPU dataset.

Refs #1

Author: Seungpyo1007

app/models/gpu.py

@@ -28,7 +28,7 @@ class DiscreteGPU(SQLModel, table=True):
     tensor_cores: int | None = None
 
     # Memory
-    memory_gb: int
+    memory_gb: float
     memory_type: str
     memory_bus_bit: int
     memory_bandwidth_gbps: float | None = None

app/schemas/gpu.py

@@ -27,7 +27,7 @@ class GPURead(BaseModel):
     stream_processors: int | None = None
     rt_cores: int | None = None
     tensor_cores: int | None = None
-    memory_gb: int
+    memory_gb: float
     memory_type: str
     memory_bus_bit: int
     memory_bandwidth_gbps: float | None = None