fix(bicep): detect param context when module ref has empty version

The lookback regex used ([^']+) requiring one or more version chars,
so 'br/modules:modules/keyvault:' (no version yet) silently fell through
to the unknown context and injected all module names instead of params.

Change + to * to allow empty version string. The param_completion_items
fallback already handles empty version by picking the closest schema.

ilsp/bicep_lsp/proxy.py

@@ -118,7 +118,7 @@ class _ProxySession:
 
         # Find the last module declaration in the lookback window
         mod_matches = list(
-            re.finditer(r"module\s+\w+\s+'br/modules:([^:]+):([^']+)'", context_text)
+            re.finditer(r"module\s+\w+\s+'br/modules:([^:]+):([^']*)'", context_text)
         )
         if mod_matches:
             last_mod = mod_matches[-1]