add structformat doc

Signed-off-by: seal90 <578935869@qq.com>

Author: seal90

daprdocs/content/en/reference/components-reference/supported-name-resolution/nr-structformat.md

@@ -0,0 +1,84 @@
+---
+type: docs
+title: "StructuredFormat"
+linkTitle: "StructuredFormat"
+description: Detailed information on the StructuredFormat name resolution component
+---
+
+
+The Structured Format name resolver provides a flexible way to resolve service names using predefined JSON or YAML format templates. It is particularly useful in scenarios where no dedicated service registry is available.
+
+## Configuration
+
+Name resolution is configured via the [Dapr Configuration]({{< ref configuration-overview.md >}}).
+
+Within the configuration YAML, set the `spec.nameResolution.component` property to `"structuredformat"`, then pass configuration options in the `spec.nameResolution.configuration` dictionary.
+
+```yaml
+apiVersion: dapr.io/v1alpha1
+kind: Configuration
+metadata:
+  name: appconfig
+spec:
+  nameResolution:
+    component: "structuredformat"
+    configuration:
+      structuredType: "jsonString"
+      stringValue: '{"appInstances":{"myapp":[{"domain":"","ipv4":"127.0.0.1","ipv6":"","port":4433,"extendedInfo":{"hello":"world"}}]}}'
+```
+
+## Spec configuration fields
+
+| Field   | Required | Details | Example |
+|---------|----------|---------|---------|
+| structuredType  | Y | Structured type: jsonString, yamlString, jsonFile, yamlFile. | jsonString |
+| stringValue  | N | This field must be configured when structuredType is set to jsonString or yamlString. | {"appInstances":{"myapp":[{"domain":"","ipv4":"127.0.0.1","ipv6":"","port":4433,"extendedInfo":{"hello":"world"}}]}} |
+| filePath  | N | This field must be configured when structuredType is set to jsonFile or yamlFile. | /path/to/yamlfile.yaml |
+
+## Examples
+
+Service ID "myapp" → "127.0.0.1:4433"
+
+- By jsonString
+```yaml
+apiVersion: dapr.io/v1alpha1
+kind: Configuration
+metadata:
+  name: appconfig
+spec:
+  nameResolution:
+    component: "structuredformat"
+    configuration:
+      structuredType: "jsonString"
+      stringValue: '{"appInstances":{"myapp":[{"domain":"","ipv4":"127.0.0.1","ipv6":"","port":4433,"extendedInfo":{"hello":"world"}}]}}'
+```
+
+- By yamlString
+  
+```yaml
+apiVersion: dapr.io/v1alpha1
+kind: Configuration
+metadata:
+  name: appconfig
+spec:
+  nameResolution:
+    component: "structuredformat"
+    configuration:
+      structuredType: "yamlString"
+      stringValue: |
+        appInstances:
+          myapp:
+           - domain: ""
+             ipv4: "127.0.0.1"
+             ipv6: ""
+             port: 4433
+             extendedInfo:
+               hello: world
+```
+
+## Notes
+
+- Empty service IDs are not allowed and will result in an error
+- Accessing a non-existent service will also result in an error
+- The structured format string must be provided in the configuration
+- The program selects the first available address according to the priority order: domain → IPv4 → IPv6, and appends the port to form the final target address