Add industrial config sync separate from collection tasks.

Periodic vendor-aware CLI sync stores zlib snapshots in Postgres with dashboard, retry, and config viewer under Network Management.

Co-authored-by: Cursor <cursoragent@cursor.com>

netx_api/config_sync_codec.py

@@ -0,0 +1,20 @@
+"""zlib + sha256 helpers for config blobs."""
+
+from __future__ import annotations
+
+import hashlib
+import zlib
+
+
+def compress_text(text: str) -> tuple[bytes, str, int, int]:
+    """Return (zlib_bytes, sha256_hex, plain_size, zlib_size)."""
+    raw = str(text or "").encode("utf-8", errors="replace")
+    digest = hashlib.sha256(raw).hexdigest()
+    blob = zlib.compress(raw, level=6)
+    return blob, digest, len(raw), len(blob)
+
+
+def decompress_text(blob: bytes | None) -> str:
+    if not blob:
+        return ""
+    return zlib.decompress(bytes(blob)).decode("utf-8", errors="replace")