feat: add development and maintenance utilities

pyav_udp_test.py:
- Simple UDP packet receiver for testing data flow
- Frame shape validation and debugging

reprocess_metadata.py:
- Batch metadata regeneration for existing images
- Gradient generation from stored image files
- JSONL metadata format with duplicate detection

pyav_udp_test.py

@@ -0,0 +1,16 @@
+import socket
+import numpy as np
+
+"udp://10.81.2.120:5000"
+#10.81.2.183
+sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+sock.bind(("0.0.0.0", 5000))
+
+COLUMN_HEIGHT, COLUMN_WIDTH, CHANNELS = 2456, 1, 3  # Example dimensions, adjust as needed
+
+while True:
+    data, addr = sock.recvfrom(65536)  # buffer size is 65536 bytes
+    #print(f"Received {len(data)} bytes from {addr}")
+    frame = np.frombuffer(data, dtype=np.uint8).reshape((COLUMN_HEIGHT, COLUMN_WIDTH, CHANNELS))
+    print(frame.shape)