Removing objective_thread_pitch from scopes_info

app/models/scope_info.py

@@ -32,8 +32,3 @@ class ScopeInfo(Base):
     objective_lens_diameter_mm: Mapped[float | None] = mapped_column(
         Float, nullable=True, default=None
     )
-    # Kept as the raw string from the sheet (e.g. "0.75", "1/16") so no precision
-    # or notation is lost; the parsed thread lives on its own AttachmentPoint.
-    objective_thread_pitch: Mapped[str | None] = mapped_column(
-        String, nullable=True, default=None
-    )