phase5: mặc định RENDER_ENGINE=bridge, gỡ pedalboard khỏi requirements/source/LICENSE

- config.py: SF_RENDER_ENGINE default 'bridge' (pedalboard GPL-3.0 đã gỡ)
- requirements.txt: bỏ pedalboard==0.9.19
- vst_engine.py: bỏ HAS_PEDALBOARD/check_pedalboard_safe/load_vst/import pedalboard;
  midi_events_to_messages giữ làm utility thuần (không gate pedalboard)
- render_engine.py: bỏ nhánh elif vst and HAS_PEDALBOARD + import thừa
- plugins.py: preview/midi-render chỉ qua native_bridge; guard SF_RENDER_ENGINE=bridge
- runtime.py: _vst_render_available() check bridge exe (SF_BRIDGE_PATH/install/) thay find_spec('pedalboard')
- LICENSE.md/THIRD_PARTY_LICENSES.md: bỏ cảnh báo GPL-3.0 pedalboard, đánh số lại
- tests: bỏ test golden so pedalboard + test requires_pedalboard; 114 passed 0 skip

app/core/vst_engine.py

@@ -6,7 +6,7 @@ import functools
 import threading
 from ctypes import c_char_p
 
-# pedalboard VST3 + pyfluidsynth KHÔNG thread-safe: tuần tự hóa mọi native render
+# Native render (bridge/pyfluidsynth) không thread-safe: tuần tự hóa
 RENDER_LOCK = threading.RLock()
 
 
@@ -166,14 +166,9 @@ def _module_available(name: str) -> bool:
         return False
 
 
-def check_pedalboard_safe():
-    return _module_available("pedalboard")
-
-
 def check_pyfluidsynth_safe():
     return _module_available("fluidsynth")
 
-HAS_PEDALBOARD = check_pedalboard_safe()
 HAS_PYFLUIDSYNTH = check_pyfluidsynth_safe()
 
 def ensure_pyfluidsynth():
@@ -182,12 +177,6 @@ def ensure_pyfluidsynth():
         HAS_PYFLUIDSYNTH = check_pyfluidsynth_safe()
     return HAS_PYFLUIDSYNTH
 
-if HAS_PEDALBOARD:
-    try:
-        from pedalboard import VST3Plugin, Pedalboard, Gain
-    except Exception:
-        HAS_PEDALBOARD = False
-
 if HAS_PYFLUIDSYNTH:
     try:
         import fluidsynth
@@ -221,7 +210,7 @@ def get_plugin_manager(vst_dir=None, sf_dir=None, upload_sf_dir=None) -> "Plugin
     """Singleton: reuse PluginManager when args match, else create new.
     Default dirs từ settings (env/.env/docker-compose hoặc user override).
     VST scan gộp thêm plugin_dirs user (Plugin Manager) — nút Synth phải liệt
-    kê được VSTi đã scan và load_vst phải tìm thấy chúng khi render."""
+    kê được VSTi đã scan."""
     from app.config import settings as _st
     vst_dir = vst_dir or _st.VST_DIR
     sf_dir = sf_dir or _st.SOUNDFONT_DIR
@@ -287,7 +276,7 @@ class PluginManager:
         self.sf_dir = sf_dir or _st.SOUNDFONT_DIR
         self.upload_sf_dir = upload_sf_dir
         # Thư mục VST thêm (plugin_dirs user scan trong Plugin Manager) —
-        # list_available()/load_vst phải thấy VSTi user đã scan (bug: nút
+        # list_available() phải thấy VSTi user đã scan (bug: nút
         # Synth chỉ quét vst_dir env mặc định /opt/daw_engine/vst3).
         self.extra_vst_dirs = [d for d in (extra_vst_dirs or []) if d]
         self._sf_scan_cache = None  # cache for _scan_soundfonts()
@@ -351,23 +340,6 @@ class PluginManager:
                     }
         return list(sf_map.values())
 
-    @_render_locked
-    def load_vst(self, plugin_name: str, preset_data: dict = None):
-        if not HAS_PEDALBOARD:
-            return None
-        plugins = self._scan_plugins()
-        if plugin_name not in plugins:
-            return None
-        path = plugins[plugin_name]
-        vst = VST3Plugin(path)
-        if preset_data:
-            for k, v in preset_data.items():
-                try:
-                    setattr(vst, k, v)
-                except Exception:
-                    pass
-        return vst
-
     def _scan_soundfonts_cached(self):
         if self._sf_scan_cache is not None:
             return self._sf_scan_cache
@@ -475,7 +447,7 @@ class PluginManager:
             "vst_instruments": [
                 {"id": k, "name": k,
                  "type": "VST3" if p.lower().endswith(".vst3") else "VST2",
-                 "has_native_support": HAS_PEDALBOARD}
+                 "has_native_support": True}
                 for k, p in plugins.items()
             ],
             "soundfonts": self._scan_soundfonts()
@@ -483,12 +455,9 @@ class PluginManager:
 
     @staticmethod
     def midi_events_to_messages(midi_events: list, bpm: float, sr: int, bank: int = None, program: int = None) -> list:
-        if not HAS_PEDALBOARD:
-            return []
         beat_duration_sec = 60.0 / max(30.0, bpm)
-        # pedalboard >= 0.9: MIDI messages là tuple (bytes, timestamp_seconds)
-        # (MidiMessage class đã bị bỏ). bytes là raw MIDI event:
-        #   0x9n note_on, 0x8n note_off, 0xB0 control_change, 0xC0 program_change
+        # MIDI message = (bytes raw MIDI, timestamp_seconds). bytes là raw MIDI
+        # event: 0x9n note_on, 0x8n note_off, 0xB0 control_change, 0xC0 program_change
         messages = []
         if bank is not None:
             messages.append((bytes([0xB0, 0, int(bank) & 0x7F]), 0.0))
@@ -607,7 +576,7 @@ def resolve_plugin_path(name_or_path: str, ext: str = "") -> str:
     return ""
 
 def apply_preset_to_plugin(plugin, preset_id=None, preset_path=None, preset_data_b64=None) -> bool:
-    """Gán preset lên plugin pedalboard: bytes nhúng (base64 .vstpreset) ưu
+    """Gán preset lên plugin VSTi: bytes nhúng (base64 .vstpreset) ưu
     tiên, sau đó preset_id (thư viện), sau preset_path (file). Trả True nếu
     áp dụng được; KHÔNG raise (render engine chỉ log warning)."""
     if plugin is None: