feat(server): busca FTS5 com filtros e paginacao

server/src/search.rs

@@ -0,0 +1,13 @@
+pub fn fts_query(q: &str) -> Option<String> {
+    let terms: Vec<String> = q
+        .split_whitespace()
+        .map(|t| t.trim_matches(['"', '\'', '*', '(', ')', ':', '[', ']']))
+        .filter(|t| !t.is_empty())
+        .map(|t| format!("\"{}\"", t))
+        .collect();
+    if terms.is_empty() {
+        None
+    } else {
+        Some(terms.join(" AND "))
+    }
+}