feat: add resources-database reference

skills/yanghuajun336/tencentcloud-terraform/references/resources-database.md

@@ -0,0 +1,55 @@
+# 数据库资源（MySQL / Redis）
+
+---
+
+## MySQL
+
+```hcl
+resource "tencentcloud_mysql_instance" "main" {
+  instance_name     = "${local.name_prefix}-mysql"
+  mem_size          = 4000    # MB
+  volume_size       = 100     # GB
+  engine_version    = "8.0"
+  root_password     = var.mysql_password   # sensitive，通过 TF_VAR_mysql_password 注入
+  availability_zone = var.availability_zones[0]
+  vpc_id            = var.vpc_id
+  subnet_id         = var.subnet_ids["private-a"]
+  security_groups   = [var.sg_id]
+  project_id        = 0
+  pay_type          = 1   # 1=按量计费，0=包年包月
+
+  tags = local.common_tags
+}
+```
+
+---
+
+## Redis
+
+```hcl
+resource "tencentcloud_redis_instance" "main" {
+  name              = "${local.name_prefix}-redis"
+  type_id           = 6       # 6=标准版，4=集群版
+  redis_version     = "5.0"
+  mem_size          = 1024    # MB
+  password          = var.redis_password   # sensitive
+  availability_zone = var.availability_zones[0]
+  vpc_id            = var.vpc_id
+  subnet_id         = var.subnet_ids["private-a"]
+  security_groups   = [var.sg_id]
+  port              = 6379
+
+  tags = local.common_tags
+}
+```
+
+---
+
+## Outputs
+
+```hcl
+output "mysql_host"     { value = tencentcloud_mysql_instance.main.intranet_ip }
+output "mysql_port"     { value = tencentcloud_mysql_instance.main.intranet_port }
+output "redis_host"     { value = tencentcloud_redis_instance.main.ip }
+output "redis_port"     { value = tencentcloud_redis_instance.main.port }
+```