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));
-            json_get_int((char *)buf, "timestamp", &ts_us);
+            if (json_get_str((char *)buf, "symbol", sym, sizeof(sym)) < 0)
+                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)