feat: add SoundFont inspection engine + AI instrument schema

- SoundFontInspector (sf2utils) scans .sf2, generates full/condensed catalog
- GET /api/v1/plugins/soundfonts/catalog with lazy init + cache invalidation
- AI tool generate_multitrack_midi now requires soundfont_id/bank/program
- Condensed catalog auto-injected into AI system prompt with bank rules
- Server render: FluidSynth program_select uses bank/program + channel routing (drums→ch9)
- VST3 pedalboard path inserts CC0 bank select + program change before notes
- DecentSamplerManager loads .dspreset with CWD fix for relative sample paths
- Pianobook render branch in render_engine.py
- Client SonicSF: controllerChange, programChange, applyAITrackInstrument
- Post-AI track creation applies instrument via applyAITrackInstrument
- Background cache rescan on .sf2 upload, frontend re-fetches catalog
- libcurl4 + VST3 dirs in Dockerfile

app/static/js/app.jsx

@@ -3351,9 +3351,13 @@ const PluginManagerModal = ({ isOpen, onClose, pluginsData }) => {
     try {
       const result = await window.SonicAPI.uploadSoundFont(file);
       setSfUploadStatus('Uploaded: ' + result.name);
-      // Refresh plugin list
+      // Refresh plugin list and catalog
       const data = await window.SonicAPI.listPlugins();
       setLocalData(data);
+      try {
+        const cat = await window.SonicAPI.getSoundfontCatalog();
+        window.__soundfontCatalog = cat;
+      } catch (_) {}
     } catch (err) {
       setSfUploadStatus('Error: ' + err.message);
     }
@@ -7027,6 +7031,11 @@ const App = () => {
             if (active) setSelectedProviderId(active.id);
           }
         } catch (e) { }
+        try {
+          window.SonicAPI.getSoundfontCatalog().then(cat => {
+            window.__soundfontCatalog = cat;
+          }).catch(() => {});
+        } catch (e) { }
       })();
     }
   };
@@ -13802,6 +13811,13 @@ const App = () => {
               }))
             };
             targetTrack.midiItems = [...(targetTrack.midiItems || []), newMidiItem];
+            if (aiTrack.soundfont_bank !== undefined && aiTrack.soundfont_program !== undefined) {
+              targetTrack.soundfont_bank = aiTrack.soundfont_bank;
+              targetTrack.soundfont_program = aiTrack.soundfont_program;
+              if (window.SonicSF && window.SonicSF.applyAITrackInstrument) {
+                window.SonicSF.applyAITrackInstrument(aiTrack.soundfont_bank, aiTrack.soundfont_program);
+              }
+            }
           });
           return updatedTracks;
         });