Fix DEDUPE_TIME_WINDOW type in web config schema to float

The config loader was changed from getint to getfloat to accept
fractional seconds (commit 9ff9f0d), but the web configuration
editor schema still declared the key as integer.  Update to float
with min=0 so the editor renders a decimal input.

https://claude.ai/code/session_01AaF4EqZPib3pmM44w8DJXD

Author: claude

src/astrameter/web_config.py

@@ -274,7 +274,7 @@ def _pm(**extras: dict[str, object]) -> dict[str, dict[str, object]]:
     "CT002": {
         "UDP_PORT": {"type": "integer"},
         "WIFI_RSSI": {"type": "integer"},
-        "DEDUPE_TIME_WINDOW": {"type": "integer"},
+        "DEDUPE_TIME_WINDOW": {"type": "float", "min": 0},
         "CONSUMER_TTL": {"type": "integer"},
         "DEBUG_STATUS": {"type": "boolean"},
         "ACTIVE_CONTROL": {"type": "boolean"},