fix: 更新 schema metadata snapshot - 补充edit_plans.result_count

#366 只加了 Alembic migration，漏了更新 snapshot 文件，
导致 Validate Alembic migrations step 的 metadata drift 检测失败。

alembic/versions/041_add_result_count_to_edit_plans.py

@@ -0,0 +1,29 @@
+"""add result_count to edit_plans
+
+Revision ID: 041_result_count
+Revises: 040_playback_speed
+Create Date: 2026-07-15 14:05:00.000000
+"""
+
+from __future__ import annotations
+
+import sqlalchemy as sa
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "041_result_count"
+down_revision = "040_playback_speed"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "edit_plans",
+        sa.Column("result_count", sa.Integer(), nullable=False, server_default="0"),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("edit_plans", "result_count")

docs/schema-metadata-snapshot.json

@@ -990,6 +990,14 @@
           "type": "FLOAT",
           "unique": false
         },
+        {
+          "index": false,
+          "name": "result_count",
+          "nullable": false,
+          "primary_key": false,
+          "type": "INTEGER",
+          "unique": false
+        },
         {
           "index": false,
           "name": "config",