feat: add webhook thought ingestion

internal/types/thought.go

@@ -14,12 +14,20 @@ type ThoughtMetadata struct {
 	Type                    string              `json:"type"`
 	Source                  string              `json:"source"`
 	Attachments             []ThoughtAttachment `json:"attachments,omitempty"`
+	Webhook                 *WebhookMetadata    `json:"webhook,omitempty"`
 	MetadataStatus          string              `json:"metadata_status,omitempty"`
 	MetadataUpdatedAt       string              `json:"metadata_updated_at,omitempty"`
 	MetadataLastAttemptedAt string              `json:"metadata_last_attempted_at,omitempty"`
 	MetadataError           string              `json:"metadata_error,omitempty"`
 }
 
+type WebhookMetadata struct {
+	ReceivedAt     string         `json:"received_at"`
+	IDempotencyKey string         `json:"idempotency_key,omitempty"`
+	ExternalID     string         `json:"external_id,omitempty"`
+	SourceMetadata map[string]any `json:"source_metadata,omitempty"`
+}
+
 type ThoughtAttachment struct {
 	FileID    uuid.UUID `json:"file_id"`
 	Name      string    `json:"name"`
@@ -30,19 +38,19 @@ type ThoughtAttachment struct {
 }
 
 type StoredFile struct {
-	ID        int64      `json:"id"`
-	GUID      uuid.UUID  `json:"guid"`
-	ThoughtID *int64     `json:"thought_id,omitempty"`
-	ProjectID *int64     `json:"project_id,omitempty"`
-	Name      string     `json:"name"`
-	MediaType string     `json:"media_type"`
-	Kind      string     `json:"kind"`
-	Encoding  string     `json:"encoding"`
-	SizeBytes int64      `json:"size_bytes"`
-	SHA256    string     `json:"sha256"`
-	Content   []byte     `json:"-"`
-	CreatedAt time.Time  `json:"created_at"`
-	UpdatedAt time.Time  `json:"updated_at"`
+	ID        int64     `json:"id"`
+	GUID      uuid.UUID `json:"guid"`
+	ThoughtID *int64    `json:"thought_id,omitempty"`
+	ProjectID *int64    `json:"project_id,omitempty"`
+	Name      string    `json:"name"`
+	MediaType string    `json:"media_type"`
+	Kind      string    `json:"kind"`
+	Encoding  string    `json:"encoding"`
+	SizeBytes int64     `json:"size_bytes"`
+	SHA256    string    `json:"sha256"`
+	Content   []byte    `json:"-"`
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
 }
 
 type StoredFileFilter struct {