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/mariadb/01_demo.sql

@@ -0,0 +1,53 @@
+CREATE DATABASE IF NOT EXISTS demo DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+USE demo;
+
+DROP TABLE IF EXISTS order_items;
+DROP TABLE IF EXISTS orders;
+DROP TABLE IF EXISTS users;
+
+CREATE TABLE users (
+  id INT PRIMARY KEY AUTO_INCREMENT,
+  name VARCHAR(64) NOT NULL,
+  email VARCHAR(128) NULL,
+  status TINYINT NOT NULL DEFAULT 1,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE orders (
+  id INT PRIMARY KEY AUTO_INCREMENT,
+  user_id INT NOT NULL,
+  amount DECIMAL(12,2) NOT NULL DEFAULT 0,
+  status VARCHAR(16) NOT NULL DEFAULT 'pending',
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  INDEX idx_orders_user (user_id)
+);
+
+CREATE TABLE order_items (
+  id INT PRIMARY KEY AUTO_INCREMENT,
+  order_id INT NOT NULL,
+  sku VARCHAR(64) NOT NULL,
+  qty INT NOT NULL DEFAULT 1,
+  price DECIMAL(12,2) NOT NULL DEFAULT 0,
+  INDEX idx_items_order (order_id)
+);
+
+INSERT INTO users (name, email, status) VALUES
+  ('alice', 'alice@demo.local', 1),
+  ('bob', 'bob@demo.local', 1),
+  ('carol', 'carol@demo.local', 1),
+  ('dave', 'dave@demo.local', 0),
+  ('erin', 'erin@demo.local', 1);
+
+INSERT INTO orders (user_id, amount, status) VALUES
+  (1, 99.50, 'paid'),
+  (1, 12.00, 'pending'),
+  (2, 250.00, 'paid'),
+  (3, 8.80, 'cancelled'),
+  (5, 41.20, 'paid');
+
+INSERT INTO order_items (order_id, sku, qty, price) VALUES
+  (1, 'SKU-A', 1, 99.50),
+  (2, 'SKU-B', 2, 6.00),
+  (3, 'SKU-C', 5, 50.00),
+  (4, 'SKU-D', 1, 8.80),
+  (5, 'SKU-E', 2, 20.60);