feat: 把 A 端的 Session/KCP/视频/控制 都收口到一个本地 daemon 进程里，Django 和输入发送端都改成通过本机 UDS HTTP 去访问它，同时补齐了观测、性能和可用性上的几个关键问题。

python/omnisocket/omnisocket_client.h

@@ -14,6 +14,33 @@ typedef struct omnisocket_session_stats {
     int connected;
 } omnisocket_session_stats_t;
 
+typedef struct omnisocket_session_kcp_metrics {
+    int connected;
+    int has_conv;
+    uint32_t conv;
+    char local_addr[OMNI_MAX_ADDR_TEXT];
+    char remote_addr[OMNI_MAX_ADDR_TEXT];
+    uint32_t rto_ms;
+    int32_t srtt_ms;
+    int32_t srttvar_ms;
+    uint64_t bytes_sent;
+    uint64_t bytes_received;
+    uint64_t in_pkts;
+    uint64_t out_pkts;
+    uint64_t in_segs;
+    uint64_t out_segs;
+    uint64_t retrans_segs;
+    uint64_t fast_retrans_segs;
+    uint64_t early_retrans_segs;
+    uint64_t lost_segs;
+    uint64_t repeat_segs;
+    uint64_t in_errs;
+    uint64_t kcp_in_errs;
+    uint64_t ring_buffer_snd_queue;
+    uint64_t ring_buffer_rcv_queue;
+    uint64_t ring_buffer_snd_buffer;
+} omnisocket_session_kcp_metrics_t;
+
 typedef struct omnisocket_session {
     pthread_mutex_t mutex;
     pthread_cond_t idle_cond;
@@ -47,5 +74,9 @@ int omnisocket_session_recv_into(
     int timeout_ms
 );
 void omnisocket_session_stats_snapshot(omnisocket_session_t *session, omnisocket_session_stats_t *out_stats);
+int omnisocket_session_kcp_metrics_snapshot(
+    omnisocket_session_t *session,
+    omnisocket_session_kcp_metrics_t *out_metrics
+);
 
 #endif