fix(lsp): use file_path parameter for mcpls 0.3.4 compatibility (#1537)

mcpls 0.3.4 renamed the path parameter to file_path in get_diagnostics
and get_hover tool calls. Update both lsp_hooks/diagnostics.rs and
lsp_hooks/hover.rs to use the correct parameter name, fixing
ErrorCode(-32602) on every diagnostics-on-save and hover-on-read call.

Closes #1531

Author: bug-ops

crates/zeph-core/src/lsp_hooks/diagnostics.rs

@@ -66,7 +66,7 @@ pub(super) async fn fetch_diagnostics(
     sanitizer: &ContentSanitizer,
 ) -> Option<LspNote> {
     let timeout = std::time::Duration::from_secs(config.call_timeout_secs);
-    let args = serde_json::json!({ "path": file_path });
+    let args = serde_json::json!({ "file_path": file_path });
 
     let call_result = match tokio::time::timeout(
         timeout,

crates/zeph-core/src/lsp_hooks/hover.rs

@@ -79,7 +79,7 @@ pub(super) async fn fetch_hover(
     let mut entries: Vec<String> =
         futures::stream::iter(positions.iter().map(|(line, character)| {
             let args = serde_json::json!({
-                "path": file_path,
+                "file_path": file_path,
                 "line": line,
                 "character": character,
             });