plugins: add bundled webhooks TaskFlow bridge (#61892)

Merged via squash.

Prepared head SHA: ca58fb77a8
Co-authored-by: mbelinky <132747814+mbelinky@users.noreply.github.com>
Co-authored-by: mbelinky <132747814+mbelinky@users.noreply.github.com>
Reviewed-by: @mbelinky

extensions/webhooks/openclaw.plugin.json

@@ -0,0 +1,48 @@
+{
+  "id": "webhooks",
+  "name": "Webhooks",
+  "description": "Authenticated inbound webhooks that bind external automation to OpenClaw TaskFlows.",
+  "configSchema": {
+    "type": "object",
+    "additionalProperties": false,
+    "$defs": {
+      "secretRef": {
+        "type": "object",
+        "additionalProperties": false,
+        "properties": {
+          "source": {
+            "type": "string",
+            "enum": ["env", "file", "exec"]
+          },
+          "provider": { "type": "string" },
+          "id": { "type": "string" }
+        },
+        "required": ["source", "provider", "id"]
+      },
+      "secretInput": {
+        "anyOf": [{ "type": "string", "minLength": 1 }, { "$ref": "#/$defs/secretRef" }]
+      },
+      "route": {
+        "type": "object",
+        "additionalProperties": false,
+        "properties": {
+          "enabled": { "type": "boolean" },
+          "path": { "type": "string", "minLength": 1 },
+          "sessionKey": { "type": "string", "minLength": 1 },
+          "secret": { "$ref": "#/$defs/secretInput" },
+          "controllerId": { "type": "string", "minLength": 1 },
+          "description": { "type": "string" }
+        },
+        "required": ["sessionKey", "secret"]
+      }
+    },
+    "properties": {
+      "routes": {
+        "type": "object",
+        "additionalProperties": {
+          "$ref": "#/$defs/route"
+        }
+      }
+    }
+  }
+}