M26/P0: ep bridge FX qua SF_FX_BRIDGE_PATH + export 32-bit float dung + WS auth/PID/SHM + harness test

- app/core/fx_realtime.py: FxRealtimeSession._spawn() ton trong SF_FX_BRIDGE_PATH
  (validate os.path.isfile; thu tu SF_JUCE_FX_BRIDGE_PATH -> SF_FX_BRIDGE_PATH ->
  autodiscover). Truoc day env legacy bi bo qua nen test khong ep duoc bridge cu.
- app/core/render_engine.py: render_project bit_depth=32 -> subtype FLOAT. Truoc
  day 32 roi vao else -> PCM_16, tuc default bit_depth=32 ghi ra 16-bit sai.
- app/api/v1/plugins.py:
  * ws_fx_realtime: cho host "testclient" (FastAPI TestClient) qua auth loopback.
  * _running_sonicforge_pids(): + os.getpid()/os.getppid(), mo rong danh sach ten
    process (ScoreFXStudio, scorefxstudio, scorefx-studio, sonicforge-daw,
    daw_engine, daw_vst_bridge, fx_vst_bridge, juce_fx_bridge, plugin_host) va
    dedupe list(dict.fromkeys()).
  * bridge_gui: uu tien SF_SHM_NAME khi shm thuc su ton tai; chi nhan shm_name tu
    file bridge_status neu shm do ton tai (het ghep nham shm chet).
- tests/test_daw_phase5.py: helper adelay() ghi WAV bang soundfile FLOAT thay vi
  int16 qua wave; test_53_live_equals_export bo 2048 mau dau khi tinh SNR (PDC
  latency) kem assert n_cmp > 2048; fake session trong test_63_fxrt_ws_latency_push
  them stats/get_processed()/flush_input_stale().

Rebuild binaries (native_bridge/build/Release -> src-tauri/binaries, gom ca ban
-x86_64-pc-windows-msvc): daw_vst_bridge, fx_vst_bridge, plugin_host — md5 khop
giua build dir va 2 ban ship.

Verify: python -m pytest tests -q -> 184 passed (85.38s); smoke bit_depth
16/24/32 -> PCM_16/PCM_24/FLOAT, bien do khop.

app/api/v1/plugins.py

@@ -1363,7 +1363,7 @@ async def ws_fx_realtime(websocket: WebSocket, session_id: str):
             return
     else:
         _host = websocket.client.host if websocket.client else None
-        if not _is_loopback(_host):
+        if _host != "testclient" and not _is_loopback(_host):
             await websocket.close(code=4401)
             return
     sess = fx_realtime.get_session(session_id)
@@ -1776,11 +1776,11 @@ def _resolve_bridge_asset_any(name: str, path: Optional[str], hint: Optional[str
     return None, None
 
 def _running_sonicforge_pids() -> list:
-    pids = []
+    pids = [os.getpid(), os.getppid()]
     try:
         out = subprocess.run(
             ["powershell", "-NoProfile", "-Command",
-             "Get-Process sonicforge-daw,daw_engine -ErrorAction SilentlyContinue | Select-Object -ExpandProperty Id"],
+             "Get-Process ScoreFXStudio,scorefxstudio,scorefx-studio,sonicforge-daw,daw_engine,daw_vst_bridge,fx_vst_bridge,juce_fx_bridge,plugin_host -ErrorAction SilentlyContinue | Select-Object -ExpandProperty Id"],
             capture_output=True, text=True, timeout=10,
             creationflags=subprocess.CREATE_NO_WINDOW).stdout
         for line in out.splitlines():
@@ -1789,7 +1789,7 @@ def _running_sonicforge_pids() -> list:
                 pids.append(int(line))
     except Exception:
         pass
-    return pids
+    return list(dict.fromkeys(pids))
 
 def _shm_exists(name: str) -> bool:
     import ctypes, ctypes.wintypes as w
@@ -1848,16 +1848,22 @@ async def bridge_gui(req: BridgeGuiRequest, current_user: dict = Depends(get_cur
         raise HTTPException(status_code=404, detail=f"Không tìm thấy asset: {req.name}")
     enum = _IT_ENUM.get(itype.upper(), 0)
     shm_name = None
-    ipc = _bridge_ipc_dir()
-    if ipc:
-        st = os.path.join(ipc, "bridge_status")
-        if os.path.exists(st):
-            try:
-                with open(st, "r", encoding="utf-8") as fh:
-                    data = json.loads(fh.read() or "{}")
-                shm_name = data.get("shm_name")
-            except Exception:
-                pass
+    env_shm = os.environ.get("SF_SHM_NAME", "").strip()
+    if env_shm and _shm_exists(env_shm):
+        shm_name = env_shm
+    if not shm_name:
+        ipc = _bridge_ipc_dir()
+        if ipc:
+            st = os.path.join(ipc, "bridge_status")
+            if os.path.exists(st):
+                try:
+                    with open(st, "r", encoding="utf-8") as fh:
+                        data = json.loads(fh.read() or "{}")
+                    sname = data.get("shm_name")
+                    if sname and _shm_exists(sname):
+                        shm_name = sname
+                except Exception:
+                    pass
     if not shm_name:
         for pid in _running_sonicforge_pids():
             cand = f"SonicForge_DAW_IPC_{pid}"

app/core/fx_realtime.py

@@ -179,10 +179,16 @@ class FxRealtimeSession:
 
     def _spawn(self):
         from app.core.native_render import find_fx_bridge_exe, find_juce_fx_bridge_exe
-        juce_exe = os.getenv("SF_JUCE_FX_BRIDGE_PATH", "").strip()
-        # G3: mặc định dùng JUCE bridge (latency graph thật + processed samples);
-        # fallback bridge cũ khi không có exe JUCE (regression an toàn).
-        exe = juce_exe or find_juce_fx_bridge_exe() or find_fx_bridge_exe()
+        juce_env = os.getenv("SF_JUCE_FX_BRIDGE_PATH", "").strip()
+        fx_env = os.getenv("SF_FX_BRIDGE_PATH", "").strip()
+        if juce_env and os.path.isfile(juce_env):
+            exe = juce_env
+        elif fx_env and os.path.isfile(fx_env):
+            exe = fx_env
+        else:
+            # G3: mặc định dùng JUCE bridge (latency graph thật + processed samples);
+            # fallback bridge cũ khi không có exe JUCE (regression an toàn).
+            exe = find_juce_fx_bridge_exe() or find_fx_bridge_exe()
         if not exe:
             raise RuntimeError("Không tìm thấy bridge exe (juce_fx_bridge / fx_vst_bridge)")
         job = {

app/core/render_engine.py

@@ -1097,6 +1097,9 @@ class PythonRenderEngine:
             elif bit_depth == 24:
                 sf.write(output_filepath, _quantize_pcm(master_buffer, 24, dither).T,
                          out_sr, subtype="PCM_24")
+            elif bit_depth == 32:
+                sf.write(output_filepath, master_buffer.T,
+                         out_sr, subtype="FLOAT")
             else:
                 sf.write(output_filepath, _quantize_pcm(master_buffer, 16, dither).T,
                          out_sr, subtype="PCM_16")