Add ProcessConfigWHIPIngest to API layer with Marshal/Unmarshal wiring

Adds ProcessConfigWHIPIngest struct to http/api/process.go and wires it
into ProcessConfig.Marshal() and ProcessConfig.Unmarshal() so that the
WHIPIngest.Enabled flag can be set via API and correctly propagates to
app.Config.WHIPIngest, which is checked by onWHIPProcessStart in
app/webrtc/whip_lifecycle.go.

Without this change, app.Config.WHIPIngest.Enabled was always false and
WHIP ingest could never activate regardless of what the UI sent.

http/api/process.go

@@ -42,7 +42,7 @@ type ProcessConfigLimits struct {
 	WaitFor uint64  `json:"waitfor_seconds" jsonschema:"minimum=0" format:"uint64"`
 }
 
-// ProcessConfig represents the configuration of an ffmpeg process
+// ProcessConfigWebRTC represents the WHEP (egress) WebRTC configuration for a process
 type ProcessConfigWebRTC struct {
 	Enabled        bool   `json:"enabled"`
 	VideoPT        uint8  `json:"video_pt,omitempty"`
@@ -52,6 +52,13 @@ type ProcessConfigWebRTC struct {
 	AudioMap       string `json:"audio_map,omitempty"`
 }
 
+// ProcessConfigWHIPIngest represents the WHIP (ingest) WebRTC configuration for a process
+type ProcessConfigWHIPIngest struct {
+	Enabled bool  `json:"enabled"`
+	VideoPT uint8 `json:"video_pt,omitempty"`
+	AudioPT uint8 `json:"audio_pt,omitempty"`
+}
+
 type ProcessConfig struct {
 	ID             string                  `json:"id"`
 	Type           string                  `json:"type" validate:"oneof='ffmpeg' ''" jsonschema:"enum=ffmpeg,enum="`
@@ -65,6 +72,7 @@ type ProcessConfig struct {
 	StaleTimeout   uint64                  `json:"stale_timeout_seconds" format:"uint64"`
 	Limits         ProcessConfigLimits     `json:"limits"`
 	WebRTC         ProcessConfigWebRTC     `json:"webrtc"`
+	WHIPIngest     ProcessConfigWHIPIngest `json:"whip_ingest"`
 }
 
 // Marshal converts a process config in API representation to a restreamer process config
@@ -88,6 +96,11 @@ func (cfg *ProcessConfig) Marshal() *app.Config {
 			VideoMap:       cfg.WebRTC.VideoMap,
 			AudioMap:       cfg.WebRTC.AudioMap,
 		},
+		WHIPIngest: app.ConfigWHIPIngest{
+			Enabled: cfg.WHIPIngest.Enabled,
+			VideoPT: cfg.WHIPIngest.VideoPT,
+			AudioPT: cfg.WHIPIngest.AudioPT,
+		},
 	}
 
 	cfg.generateInputOutputIDs(cfg.Input)
@@ -175,6 +188,10 @@ func (cfg *ProcessConfig) Unmarshal(c *app.Config) {
 	cfg.WebRTC.VideoMap = c.WebRTC.VideoMap
 	cfg.WebRTC.AudioMap = c.WebRTC.AudioMap
 
+	cfg.WHIPIngest.Enabled = c.WHIPIngest.Enabled
+	cfg.WHIPIngest.VideoPT = c.WHIPIngest.VideoPT
+	cfg.WHIPIngest.AudioPT = c.WHIPIngest.AudioPT
+
 	cfg.Options = make([]string, len(c.Options))
 	copy(cfg.Options, c.Options)
 
@@ -225,7 +242,7 @@ type ProcessReport struct {
 	History []ProcessReportHistoryEntry `json:"history"`
 }
 
-// Unmarshal converts a restream log to a report
+// Unmarshal converts a restreamer log to a report
 func (report *ProcessReport) Unmarshal(l *app.Log) {
 	if l == nil {
 		return