v0.2.0: CRM/ERP 系统升级 - 清理 .gitignore 并移除误提交的 venv/env/db 文件

- 更新 .gitignore：全面覆盖环境变量、数据库、日志、缓存、上传文件
- 移除误跟踪的 server/venv/、crm_data.db、.env 文件
- 新增 server/.env.example 模板
- 新增合同管理、利润核算、AI教练等功能模块
- 新增 Playwright e2e 测试套件
- 前后端多项功能升级和 bug 修复

server/alembic/versions/20260319_add_xinyu_company.py

@@ -0,0 +1,43 @@
+"""add xinyu lubricant company
+
+Revision ID: b2c3d4e5f6a7
+Revises: a1b2c3d4e5f6
+Create Date: 2026-03-19
+"""
+from alembic import op
+
+revision = "b2c3d4e5f6a7"
+down_revision = "a1b2c3d4e5f6"
+branch_labels = None
+depends_on = None
+
+XINYU_COMPANY_ID = "aaaaaaaa-bbbb-cccc-dddd-eeeeeeee0002"
+
+
+def upgrade() -> None:
+    # 1. 插入第二个公司：新宇润滑油
+    op.execute(f"""
+        INSERT INTO sys_companies (id, name, code, is_active)
+        VALUES ('{XINYU_COMPANY_ID}', '新宇润滑油', 'XY-LUB', true)
+        ON CONFLICT (id) DO NOTHING
+    """)
+
+    # 2. 将所有现有用户关联到新宇润滑油（非默认）
+    op.execute(f"""
+        INSERT INTO sys_user_companies (id, user_id, company_id, is_default)
+        SELECT gen_random_uuid(), id, '{XINYU_COMPANY_ID}'::uuid, false
+        FROM sys_users
+        WHERE id NOT IN (
+            SELECT user_id FROM sys_user_companies
+            WHERE company_id = '{XINYU_COMPANY_ID}'::uuid
+        )
+    """)
+
+
+def downgrade() -> None:
+    op.execute(f"""
+        DELETE FROM sys_user_companies WHERE company_id = '{XINYU_COMPANY_ID}'::uuid
+    """)
+    op.execute(f"""
+        DELETE FROM sys_companies WHERE id = '{XINYU_COMPANY_ID}'::uuid
+    """)