Add Wav2Lip mel-spectrogram fallback to ensure lip-sync integration

[Copilot]

The system must avoid dummy code and ensure backend modules function even when optional Wav2Lip assets aren’t present.

• Backend: LipSyncService now attempts Wav2Lip’s audio.melspectrogram and falls back to an internal mel-spectrogram implementation mirroring the setup script parameters (80 mels, 16 kHz, FFT 800, hop 200, win 800). This keeps lip-sync functional when audio.py isn’t on the path.

Example:

# Before: hard import from audio.py could fail if missing
from audio import melspectrogram
mel = melspectrogram(audio_data)

# After: graceful fallback when audio.py is unavailable
try:
    from audio import melspectrogram
    mel = melspectrogram(audio_data)
except Exception:
    mel = self._melspectrogram_fallback(audio_data)

Original prompt

check that ll files and frontend, bcknd nd other files all are integreeaetd peerfectly and in working nothing is dummy codde preesent nd also in reequiremeents all modules aarelisted needed to insll or not evey things verifyt

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[Dynamo2k]

@copilot ┌──(venv)─(dynamo💀Uchiha)-[/mnt/…/Cyber Security/Project/PAINAS/backend]
└─$ pip show fastapi starlette sse-starlette
Name: fastapi
Version: 0.109.1
Summary: FastAPI framework, high performance, easy to learn, fast to code, ready for production
Home-page: https://github.com/tiangolo/fastapi
Author:
Author-email: Sebastián Ramírez tiangolo@gmail.com
License:
Location: /mnt/e/Cyber Security/Project/PAINAS/venv/lib/python3.11/site-packages
Requires: pydantic, starlette, typing-extensions
Required-by: sse-starlette

Name: starlette
Version: 0.35.1
Summary: The little ASGI library that shines.
Home-page: https://github.com/encode/starlette
Author:
Author-email: Tom Christie tom@tomchristie.com
License:
Location: /mnt/e/Cyber Security/Project/PAINAS/venv/lib/python3.11/site-packages
Requires: anyio
Required-by: fastapi, sse-starlette

Name: sse-starlette
Version: 1.8.2
Summary: SSE plugin for Starlette
Home-page:
Author:
Author-email: sysid sysid@gmx.de
License: BSD-3-Clause
Location: /mnt/e/Cyber Security/Project/PAINAS/venv/lib/python3.11/site-packages
Requires: anyio, fastapi, starlette, uvicorn
Required-by:

┌──(venv)─(dynamo💀Uchiha)-[/mnt/…/Cyber Security/Project/PAINAS/backend]
└─$ uvicorn main:app --host 0.0.0.0 --port 8000 --reload
INFO: Will watch for changes in these directories: ['/mnt/e/Cyber Security/Project/PAINAS/backend']
INFO: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
INFO: Started reloader process [743621] using WatchFiles
2026-01-27 02:06:55.428 | INFO | services.identity_service:init:46 - IdentityService initialized with directory: /mnt/e/Cyber Security/Project/PAINAS/data/identities
Process SpawnProcess-1:
Traceback (most recent call last):
File "/usr/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
self.run()
File "/usr/lib/python3.11/multiprocessing/process.py", line 108, in run
self._target(*self._args, **self._kwargs)
File "/home/dynamo/.local/lib/python3.11/site-packages/uvicorn/_subprocess.py", line 78, in subprocess_started
target(sockets=sockets)
File "/home/dynamo/.local/lib/python3.11/site-packages/uvicorn/server.py", line 62, in run
return asyncio.run(self.serve(sockets=sockets))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/asyncio/runners.py", line 190, in run
return runner.run(main)
^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/asyncio/runners.py", line 118, in run
return self._loop.run_until_complete(task)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "uvloop/loop.pyx", line 1518, in uvloop.loop.Loop.run_until_complete
File "/home/dynamo/.local/lib/python3.11/site-packages/uvicorn/server.py", line 69, in serve
config.load()
File "/home/dynamo/.local/lib/python3.11/site-packages/uvicorn/config.py", line 458, in load
self.loaded_app = import_from_string(self.app)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/dynamo/.local/lib/python3.11/site-packages/uvicorn/importer.py", line 24, in import_from_string
raise exc from None
File "/home/dynamo/.local/lib/python3.11/site-packages/uvicorn/importer.py", line 21, in import_from_string
module = importlib.import_module(module_str)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/importlib/init.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "", line 1206, in _gcd_import
File "", line 1178, in _find_and_load
File "", line 1149, in _find_and_load_unlocked
File "", line 690, in _load_unlocked
File "", line 940, in exec_module
File "", line 241, in _call_with_frames_removed
File "/mnt/e/Cyber Security/Project/PAINAS/backend/main.py", line 19, in
from api import identity, generation, health
File "/mnt/e/Cyber Security/Project/PAINAS/backend/api/generation.py", line 18, in
from sse_starlette.sse import EventSourceResponse
ModuleNotFoundError: No module named 'sse_starlette'
^CINFO: Stopping reloader process [743621]

┌──(venv)─(dynamo💀Uchiha)-[/mnt/…/Cyber Security/Project/PAINAS/backend]
└─$