feat(rag): replace LiteParse flows with LightRAG provider

rust/crates/mnote-web/src/routes/evidence.rs

@@ -17,14 +17,23 @@ use serde_json::{json, Value};
 use std::path::{Component, Path};
 
 pub async fn search(
-    State(state): State<AppState>,
+    State(_state): State<AppState>,
     Extension(context): Extension<RequestContext>,
-    Json(body): Json<EvidenceSearchRequest>,
+    Json(_body): Json<EvidenceSearchRequest>,
 ) -> Result<(StatusCode, HeaderMap, Json<Value>), WebError> {
-    let response = search_payload(&state, &context, body).await?;
     let mut headers = HeaderMap::new();
     headers.insert("content-type", HeaderValue::from_static("application/json"));
-    Ok((StatusCode::OK, headers, Json(response)))
+    Ok((
+        StatusCode::GONE,
+        headers,
+        Json(json!({
+            "ok": false,
+            "code": "mnote_evidence_search_retired",
+            "message": "旧 LiteParse/evidence 搜索已退役；PDF、Office、图片 OCR 与资料索引统一走 /api/knowledge-rag/query",
+            "requestId": context.trace.request_id,
+            "traceId": context.trace.trace_id,
+        })),
+    ))
 }
 
 pub(crate) async fn search_payload(
@@ -241,7 +250,7 @@ fn suggested_evidence_queries(query: &str) -> Vec<String> {
     suggestions
 }
 
-fn citation_markdown_for_locator(locator: &EvidenceLocator) -> String {
+pub(crate) fn citation_markdown_for_locator(locator: &EvidenceLocator) -> String {
     let label = citation_label_for_locator(locator);
     let url = citation_url_for_locator(locator);
     format!(
@@ -280,7 +289,7 @@ fn citation_label_for_locator(locator: &EvidenceLocator) -> String {
     parts.join(" · ")
 }
 
-fn citation_url_for_locator(locator: &EvidenceLocator) -> String {
+pub(crate) fn citation_url_for_locator(locator: &EvidenceLocator) -> String {
     let owner_document_id = locator.owner_document_id.trim();
     let mut url = if owner_document_id.is_empty() {
         let existing = locator.open_action.url.trim();