feat: Add admin management system with super admin controls

- Implemented two-level admin hierarchy (super admin from .env and assigned admins)
- Only super admins (from ADMIN_IDS in .env) can manage admin assignments
- Added admin management menu to settings (visible only for super admins)
- Admins can add/remove other admins through the bot interface
- Protected super admins from deletion
- Added CLI tool for admin management (scripts/manage_admins.py)
- Added database check script (scripts/check_db.py)
- Added deployment scripts for server setup
- Added comprehensive documentation on admin management system
- Added backup and server deployment guides

migrations/versions/20260218_0402_12_merge_migration.py

@@ -0,0 +1,24 @@
+"""merge branches
+
+Revision ID: merge_migration
+Revises: 41aae82e631b, cd31303a681c
+Create Date: 2026-02-18 04:02:12.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'merge_migration'
+down_revision = ('41aae82e631b', 'cd31303a681c')
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    pass
+
+
+def downgrade():
+    pass