Add stub for missing add_friends_table migration

Alembic could not traverse the migration graph because add_friends_table
was referenced by 6ec7ce03bb6a but never committed to the repo. This stub
unblocks flask db upgrade / db stamp in deploys.

Author: JoshD94

migrations/versions/add_friends_table_stub.py

@@ -0,0 +1,30 @@
+"""Stub for add_friends_table revision
+
+The original add_friends_table migration file was never committed to the repo,
+but 6ec7ce03bb6a_change_workout_goal_type_to_integer.py references it as its
+down_revision. Without this stub, Alembic cannot traverse the migration graph
+and `flask db upgrade` / `db stamp` fail with KeyError: 'add_friends_table'.
+
+This stub is a no-op — the friends table is created by SQLAlchemy
+Base.metadata.create_all() in init_db(), not by any migration.
+
+Revision ID: add_friends_table
+Revises:
+Create Date: 2026-04-19 20:09:00.000000
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = 'add_friends_table'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    pass
+
+
+def downgrade():
+    pass