fix(config): accept integer 0/1 for bool fields in RawWiki deserialization

VimL dicts serialise boolean-like settings such as `auto_export = 1`
as the JSON number `1`, not `true`.  serde's default `Option<bool>`
deserializer rejects that, causing `serde_json::from_value::<InitOptions>`
to return `Err` and `.ok()` to silently discard the entire wikis list.
The server then fell back to `wiki_root` and could not resolve per-wiki
links, marking every cross-wiki link as broken.

Add an `opt_bool_or_int` serde helper that accepts JSON bool, `null`,
or integers (0 = false, non-zero = true), and apply it to `auto_export`,
`html_filename_parameterization`, `listsyms_propagate`, and `auto_toc`
in `RawWiki`.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

crates/nuwiki-lsp/src/config.rs

@@ -389,6 +389,39 @@ impl Config {
 
 // ===== Wire schema =====
 
+/// Custom serde helper: accept JSON `true`/`false` **or** integers `0`/`1`
+/// for `Option<bool>` fields.  VimL dicts serialise `auto_export = 1` as
+/// the JSON number `1`, not `true`, which would otherwise silently break
+/// deserialisation of the entire `RawWiki` and cause the server to fall
+/// back to `wiki_root` (ignoring the wikis list and marking every link
+/// broken).
+mod opt_bool_or_int {
+    use serde::{Deserialize, Deserializer};
+
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<Option<bool>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let v = Option::<serde_json::Value>::deserialize(deserializer)?;
+        match v {
+            None | Some(serde_json::Value::Null) => Ok(None),
+            Some(serde_json::Value::Bool(b)) => Ok(Some(b)),
+            Some(serde_json::Value::Number(ref n)) => {
+                if let Some(i) = n.as_i64() {
+                    Ok(Some(i != 0))
+                } else {
+                    Err(serde::de::Error::custom(
+                        "expected bool or 0/1 integer for bool field",
+                    ))
+                }
+            }
+            Some(other) => Err(serde::de::Error::custom(format!(
+                "expected bool or 0/1 integer, got {other}"
+            ))),
+        }
+    }
+}
+
 #[derive(Debug, Default, Deserialize)]
 #[serde(default, rename_all = "snake_case")]
 struct InitOptions {
@@ -427,9 +460,9 @@ struct RawWiki {
     template_date_format: Option<String>,
     #[serde(default)]
     css_name: Option<String>,
-    #[serde(default)]
+    #[serde(default, deserialize_with = "opt_bool_or_int::deserialize")]
     auto_export: Option<bool>,
-    #[serde(default)]
+    #[serde(default, deserialize_with = "opt_bool_or_int::deserialize")]
     html_filename_parameterization: Option<bool>,
     #[serde(default)]
     exclude_files: Option<Vec<String>>,
@@ -453,7 +486,7 @@ struct RawWiki {
     maxhi: Option<u8>,
     #[serde(default)]
     listsyms: Option<String>,
-    #[serde(default)]
+    #[serde(default, deserialize_with = "opt_bool_or_int::deserialize")]
     listsyms_propagate: Option<bool>,
     #[serde(default)]
     list_margin: Option<i32>,
@@ -461,7 +494,7 @@ struct RawWiki {
     links_space_char: Option<String>,
     #[serde(default)]
     nested_syntaxes: Option<std::collections::HashMap<String, String>>,
-    #[serde(default)]
+    #[serde(default, deserialize_with = "opt_bool_or_int::deserialize")]
     auto_toc: Option<bool>,
 }