Add CRM order queue: live sync, view modal, receipt tabs, delete

Wires the CRM (exoCRM GetOrders) into the dashboard as a locally
persisted order queue instead of the previous static mockup:

- CrmClient Protocol + ExoCrmClient/StubCrmClient for the CRM's
  signed JSON-RPC API
- Order model + migration, synced from CRM on each queue view;
  soft-deleted orders stay hidden across re-syncs
- GET/DELETE /api/v1/orders with "no receipt"/"receipt issued" tabs
  (the latter is empty until Checkbox fiscalization lands)
- Dashboard: real order list, item-detail modal, tab switcher,
  one-click delete

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

backend/alembic/versions/0002_orders.py

@@ -0,0 +1,46 @@
+"""Локальная копия заказов, синхронизированная из CRM
+
+Revision ID: 0002
+Revises: 0001
+Create Date: 2026-09-22
+"""
+
+from __future__ import annotations
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.dialects import postgresql
+
+revision: str = "0002"
+down_revision: str | None = "0001"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "orders",
+        sa.Column("id", sa.String(length=32), nullable=False),
+        sa.Column("create_date_time", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("recipient_name", sa.String(length=255), nullable=True),
+        sa.Column("recipient_phone", sa.String(length=32), nullable=True),
+        sa.Column("recipient_email", sa.String(length=320), nullable=True),
+        sa.Column("waybill_number", sa.String(length=64), nullable=True),
+        sa.Column("notes", sa.Text(), nullable=True),
+        sa.Column("total_amount_kopecks", sa.BigInteger(), nullable=False),
+        sa.Column("goods", postgresql.JSONB(astext_type=sa.Text()), nullable=False),
+        sa.Column("is_deleted", sa.Boolean(), nullable=False),
+        sa.Column("deleted_at", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("receipt_created_at", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
+        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.text("now()"), nullable=False),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_orders")),
+    )
+    op.create_index(op.f("ix_orders_is_deleted"), "orders", ["is_deleted"])
+    op.create_index(op.f("ix_orders_receipt_created_at"), "orders", ["receipt_created_at"])
+
+
+def downgrade() -> None:
+    op.drop_table("orders")