fix: normalize literal \n separators in ParseProxyLines

Some frontends stuff multi-line subscription content into a single
string with literal backslash-n sequences. The whole blob parsed as
one URI whose fragment swallowed the remaining links (1 node with a
garbage name instead of N nodes).

Normalize literal \r\n / \n to real newlines at the ParseProxyLines
entry, after format detection and before splitting. Real newline
input and single links are unaffected.

HH-766

internal/proxy/format.go

@@ -127,7 +127,15 @@ func ParseYamlProxies(raw string) []model.ProxyNode {
 
 // ParseProxyLines splits raw text into lines, skips comments/blanks/section headers,
 // and parses each line as a URI or client config line.
+//
+// Literal "\n" / "\r\n" sequences (backslash + n, as produced by some frontends
+// stuffing multi-line content into a single string) are normalized to real
+// newlines before splitting so each link is parsed as its own line.
 func ParseProxyLines(raw string) []model.ProxyNode {
+	if strings.Contains(raw, `\n`) {
+		raw = strings.ReplaceAll(raw, `\r\n`, "\n")
+		raw = strings.ReplaceAll(raw, `\n`, "\n")
+	}
 	lines := strings.Split(raw, "\n")
 	var result []model.ProxyNode
 	index := 0