feat(dict): high-speed offline dictionary with wordforms and zero daemon SQLite mmap

app/dictionary.py

@@ -240,8 +240,40 @@ async def lookup_term(query: str) -> Dict[str, Any]:
             except Exception:
                 pass
 
-    words = query_clean.split()
-    is_sentence = len(words) > 4
+        # Check offline dictionary first (Zero Daemon, < 0.1ms via SQLite mmap)
+        words = query_clean.split()
+        is_sentence = len(words) > 4
+        if not is_sentence:
+            try:
+                off_row = conn.execute(
+                    "SELECT term, translation, phonetic, pos FROM offline_dictionary WHERE term = ? COLLATE NOCASE",
+                    (query_clean,)
+                ).fetchone()
+                if off_row:
+                    raw_trans = off_row["translation"] or ""
+                    tr_list = [t.strip() for t in raw_trans.split(",") if t.strip()]
+                    res = {
+                        "query": query_clean,
+                        "is_sentence": False,
+                        "translation": raw_trans,
+                        "translations_list": tr_list,
+                        "translation_ru": raw_trans,
+                        "phonetic": off_row["phonetic"] or "",
+                        "audio_file": "",
+                        "audio_url": "",
+                        "part_of_speech": off_row["pos"] or "",
+                        "definitions": [],
+                        "examples": [],
+                        "source": "offline",
+                    }
+                    conn.execute(
+                        "INSERT OR REPLACE INTO dictionary_cache (query, response_json) VALUES (?, ?)",
+                        (query_clean, json.dumps(res, ensure_ascii=False))
+                    )
+                    return res
+            except Exception:
+                pass
+
 
     result: Dict[str, Any] = {
         "query": query_clean,