feat: OpsxDB 桌面数据库客户端首版入库

含工作台/连库多引擎字段与 SSH·SSL、结果编辑、Redis 键浏览、
Tauri 桌面与 docs/落地页；排除本地构建产物与 sidecar 二进制。

tests/init/mssql/01_demo.sql

@@ -0,0 +1,40 @@
+IF DB_ID('demo') IS NULL CREATE DATABASE demo;
+GO
+USE demo;
+GO
+IF OBJECT_ID('dbo.users','U') IS NOT NULL DROP TABLE dbo.order_items;
+IF OBJECT_ID('dbo.orders','U') IS NOT NULL DROP TABLE dbo.orders;
+IF OBJECT_ID('dbo.users','U') IS NOT NULL DROP TABLE dbo.users;
+GO
+CREATE TABLE dbo.users (
+  id INT IDENTITY(1,1) PRIMARY KEY,
+  name NVARCHAR(64) NOT NULL,
+  email NVARCHAR(128) NULL,
+  status TINYINT NOT NULL DEFAULT 1,
+  created_at DATETIME2 DEFAULT SYSUTCDATETIME()
+);
+CREATE TABLE dbo.orders (
+  id INT IDENTITY(1,1) PRIMARY KEY,
+  user_id INT NOT NULL,
+  amount DECIMAL(12,2) NOT NULL DEFAULT 0,
+  status NVARCHAR(16) NOT NULL DEFAULT 'pending',
+  created_at DATETIME2 DEFAULT SYSUTCDATETIME()
+);
+CREATE TABLE dbo.order_items (
+  id INT IDENTITY(1,1) PRIMARY KEY,
+  order_id INT NOT NULL,
+  sku NVARCHAR(64) NOT NULL,
+  qty INT NOT NULL DEFAULT 1,
+  price DECIMAL(12,2) NOT NULL DEFAULT 0
+);
+INSERT INTO dbo.users (name, email, status) VALUES
+  (N'alice', N'alice@demo.local', 1),
+  (N'bob', N'bob@demo.local', 1),
+  (N'carol', N'carol@demo.local', 1),
+  (N'dave', N'dave@demo.local', 0),
+  (N'erin', N'erin@demo.local', 1);
+INSERT INTO dbo.orders (user_id, amount, status) VALUES
+  (1, 99.50, N'paid'), (1, 12.00, N'pending'), (2, 250.00, N'paid'), (3, 8.80, N'cancelled'), (5, 41.20, N'paid');
+INSERT INTO dbo.order_items (order_id, sku, qty, price) VALUES
+  (1, N'SKU-A', 1, 99.50), (2, N'SKU-B', 2, 6.00), (3, N'SKU-C', 5, 50.00), (4, N'SKU-D', 1, 8.80), (5, N'SKU-E', 2, 20.60);
+GO