fix: WS frame parser — skip oversized payload to keep sync

- ws_client.c: When payload exceeds buffer, consume remaining bytes
  before returning error to prevent parser desynchronization.
- market_feed.c: Increase receive buffer 4K→64K, support both
  standard (symbol/timestamp) and compact (s/ts) JSON field names.
- ws_client.c: Disable per-frame debug print in release mode.

Co-Authored-By: Claude <noreply@anthropic.com>

app/market_feed.c

@@ -351,7 +351,7 @@ int main(int argc, char *argv[])
             rte_ring_sp_enqueue_burst(ring->in, (void **)rx, nb_rx, NULL);
 
         /* Receive WebSocket frame */
-        uint8_t buf[4096];
+        uint8_t buf[65536];
         int opcode = 0, buflen = sizeof(buf);
         int ws_ret = ws_recv_frame(sockfd, &opcode, buf, &buflen);
 
@@ -360,11 +360,13 @@ int main(int argc, char *argv[])
             buf[buflen] = '\0';
             uint64_t now_us = rte_get_timer_cycles() * 1000000 / tsc_hz;
 
-            /* Parse symbol and timestamp from JSON */
+            /* Parse symbol and timestamp from JSON (supports compact & full keys) */
             char sym[32] = "unknown";
             uint64_t ts_us = 0;
-            json_get_str((char *)buf, "symbol", sym, sizeof(sym));
+            if (json_get_str((char *)buf, "symbol", sym, sizeof(sym)) < 0)
-            json_get_int((char *)buf, "timestamp", &ts_us);
+                json_get_str((char *)buf, "s", sym, sizeof(sym));  /* compact format */
+            if (json_get_int((char *)buf, "timestamp", &ts_us) < 0)
+                json_get_int((char *)buf, "ts", &ts_us);           /* compact format */
 
             int idx = stats_find_or_add(sym);
             if (idx >= 0 && ts_us > 0 && now_us > ts_us)

src/ws_client.c

@@ -314,7 +314,7 @@ int ws_recv_frame(int sockfd, int *opcode, uint8_t *buf, int *buflen)
 
     static int frame_count = 0;
     frame_count++;
-    if (frame_count <= 3 || *opcode != 0x01)
+    if (0) /* debug disabled — enable for parser troubleshooting */
         printf("[WS DEBUG #%d] byte0=0x%02x byte1=0x%02x opcode=%d fin=%d masked=%d plen=%lu\n",
                frame_count, byte0, byte1, *opcode, fin, masked, payload_len);
 
@@ -386,8 +386,16 @@ int ws_recv_frame(int sockfd, int *opcode, uint8_t *buf, int *buflen)
     /* Read payload */
     if (payload_len > (uint64_t)(*buflen))
     {
-        printf("[WS] WARNING: payload %lu > buffer %d\n",
+        printf("[WS] WARNING: payload %lu > buffer %d, skipping\n",
                payload_len, *buflen);
+        /* Consume (skip) oversized payload to keep parser in sync */
+        uint64_t remain = payload_len;
+        uint8_t skip_buf[2048];
+        while (remain > 0) {
+            int chunk = (int)(remain < sizeof(skip_buf) ? remain : sizeof(skip_buf));
+            if (ws_read(sockfd, skip_buf, chunk) <= 0) break;
+            remain -= chunk;
+        }
         return -1;
     }