Add 3x-ui v3.5.0 API panel connection and client management

Co-authored-by: Cursor <cursoragent@cursor.com>

alembic/versions/0005_xui_panels.py

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+"""Add xui_panels for 3x-ui API connections
+
+Revision ID: 0005_xui_panels
+Revises: 0004_real_vpn
+Create Date: 2026-07-25
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "0005_xui_panels"
+down_revision: Union[str, None] = "0004_real_vpn"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "xui_panels",
+        sa.Column("id", sa.Integer(), primary_key=True),
+        sa.Column("name", sa.String(length=120), nullable=False),
+        sa.Column("base_url", sa.String(length=512), nullable=False),
+        sa.Column("username", sa.String(length=128), nullable=True),
+        sa.Column("password", sa.Text(), nullable=True),
+        sa.Column("api_token", sa.Text(), nullable=True),
+        sa.Column("verify_ssl", sa.Boolean(), nullable=False, server_default=sa.text("true")),
+        sa.Column("is_reachable", sa.Boolean(), nullable=False, server_default=sa.text("false")),
+        sa.Column("last_error", sa.Text(), nullable=True),
+        sa.Column("panel_info", sa.Text(), nullable=True),
+        sa.Column("last_checked", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("is_enabled", sa.Boolean(), nullable=False, server_default=sa.text("true")),
+        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("xui_panels")