feat(ai): integrate local Ollama AI for in-context sentence translation and caching (Task 13)

app/static/js/modules/api.js

@@ -66,11 +66,7 @@ export const api = {
             return resp.ok ? await resp.json() : [];
         },
         async lookup(term) {
-            const resp = await fetch(`/api/lookup?term=${encodeURIComponent(term)}`);
-            if (resp.ok) {
-                return await resp.json();
-            }
-            throw new Error(`Lookup failed: ${resp.status}`);
+            return await api.lookup.search(term);
         },
         async create(payload) {
             return await fetch('/api/cards', {
@@ -98,6 +94,35 @@ export const api = {
         }
     },
 
+    // Dictionary Lookup & AI Sentence Translation
+    lookup: {
+        async search(term) {
+            const resp = await fetch(`/api/lookup?term=${encodeURIComponent(term)}`);
+            if (resp.ok) {
+                return await resp.json();
+            }
+            throw new Error(`Lookup failed: ${resp.status}`);
+        },
+        async translateSentence(sentence, targetWord = '') {
+            const resp = await fetch('/api/translate-sentence', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({
+                    sentence: sentence,
+                    target_word: targetWord
+                })
+            });
+            if (resp.ok) {
+                return await resp.json();
+            }
+            throw new Error(`Sentence translation failed: ${resp.status}`);
+        },
+        async getAiStatus() {
+            const resp = await fetch('/api/ai/status');
+            return resp.ok ? await resp.json() : { online: false, models: [] };
+        }
+    },
+
     // Collections & Tags
     collections: {
         async getAll() {