Feat/Add API Trigger and Webhooks in Agent Builder (#83)

* feat: add api trigger node for agent runs

* feat: add webhook node

* Execute webhook nodes post workflow run

* Add hint to go to API keys

api/services/workflow/dto.py

@@ -9,6 +9,8 @@ class NodeType(str, Enum):
     endNode = "endCall"
     agentNode = "agentNode"
     globalNode = "globalNode"
+    trigger = "trigger"
+    webhook = "webhook"
 
 
 class Position(BaseModel):
@@ -28,9 +30,20 @@ class ExtractionVariableDTO(BaseModel):
     prompt: Optional[str] = None
 
 
+class CustomHeaderDTO(BaseModel):
+    key: str
+    value: str
+
+
+class RetryConfigDTO(BaseModel):
+    enabled: bool = False
+    max_retries: int = 3
+    retry_delay_seconds: int = 5
+
+
 class NodeDataDTO(BaseModel):
     name: str = Field(..., min_length=1)
-    prompt: str = Field(..., min_length=1)
+    prompt: Optional[str] = Field(default=None)
     is_static: bool = False
     is_start: bool = False
     is_end: bool = False
@@ -44,6 +57,15 @@ class NodeDataDTO(BaseModel):
     detect_voicemail: bool = True
     delayed_start: bool = False
     delayed_start_duration: Optional[float] = None
+    trigger_path: Optional[str] = None
+    # Webhook node specific fields
+    enabled: bool = True
+    http_method: Optional[str] = None
+    endpoint_url: Optional[str] = None
+    credential_uuid: Optional[str] = None
+    custom_headers: Optional[list[CustomHeaderDTO]] = None
+    payload_template: Optional[dict] = None
+    retry_config: Optional[RetryConfigDTO] = None
 
 
 class RFNodeDTO(BaseModel):
@@ -52,6 +74,14 @@ class RFNodeDTO(BaseModel):
     position: Position
     data: NodeDataDTO
 
+    @model_validator(mode="after")
+    def _validate_prompt_required(self):
+        """Require prompt for all node types except trigger and webhook."""
+        if self.type not in (NodeType.trigger, NodeType.webhook):
+            if not self.data.prompt or len(self.data.prompt.strip()) == 0:
+                raise ValueError("Prompt is required for non-trigger nodes")
+        return self
+
 
 class EdgeDataDTO(BaseModel):
     label: str = Field(..., min_length=1)