feat(voice): Pas 2 — install voice deps, vendor discord-ext-voice-recv, setup assets

Foundation pentru Discord voice-to-voice pipeline.

- requirements.txt: faster-whisper, silero-vad, num2words, numpy, PyNaCl
- vendor/discord-ext-voice-recv/: vendored la commit ac04ea7b09 (bump version
  0.5.3a) — Discord voice protocol fragil, upstream hobby fork. Adapter layer
  in src/voice/_discord_voice_adapter.py izolează churn (swap la py-cord =
  doar acel fișier rescris). VENDOR_INFO.md documentează update procedure.
- tools/voice_setup.py: idempotent setup script — libopus check, ffmpeg
  check, Supertonic reachable, faster-whisper/silero-vad warm, assets
  generation. Exit 0 = green, 1 = needs human (currently libopus missing
  needs `sudo apt install -y libopus0`).
- assets/voice/: thinking.wav (filler "Stai puțin să-mi adun gândurile",
  ~2.8s), mhm.wav (listener noise), beep_200ms.wav (wake-up tone 880Hz).
- src/voice/__init__.py: package stub.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

vendor/discord-ext-voice-recv/setup.py

@@ -0,0 +1,70 @@
+# -*- coding: utf-8 -*-
+
+from setuptools import setup
+import re
+
+with open('discord/ext/voice_recv/__init__.py') as f:
+    version = re.search(r'^__version__\s*=\s*[\'"]([^\'"]*)[\'"]', f.read(), re.MULTILINE).group(1)  # type: ignore
+
+if not version:
+    raise RuntimeError('version is not set')
+
+if version.endswith(('a', 'b', 'rc')):
+    # append version identifier based on commit count
+    try:
+        import subprocess
+
+        p = subprocess.Popen(['git', 'rev-list', '--count', 'HEAD'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        out, err = p.communicate()
+        if out:
+            version = version + out.decode('utf-8').strip()
+    except Exception:
+        pass
+
+with open('README.md') as f:
+    readme = f.read()
+
+extras_require = {
+    'extras_speech': [
+        'SpeechRecognition',
+    ],
+    'extras_local': [
+        'pyaudio',
+    ],
+    'extras': [
+        'SpeechRecognition',
+        'pyaudio',
+    ],
+}
+
+setup(
+    name='discord-ext-voice_recv',
+    author='Imayhaveborkedit',
+    url='https://github.com/imayhaveborkedit/discord-ext-voice-recv',
+    version=version,
+    packages=['discord.ext.voice_recv', 'discord.ext.voice_recv.extras'],
+    license='MIT',
+    description='Experimental voice receive extension for discord.py',
+    long_description=readme,
+    long_description_content_type='text/markdown',
+    include_package_data=True,
+    python_requires='>=3.8',
+    install_requires=['discord.py[voice]>=2.5'],
+    extras_require=extras_require,
+    zip_safe=False,
+    classifiers=[
+        'Development Status :: 3 - Alpha',
+        'License :: OSI Approved :: MIT License',
+        'Intended Audience :: Developers',
+        'Natural Language :: English',
+        'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
+        'Programming Language :: Python :: 3.11',
+        'Programming Language :: Python :: 3.12',
+        'Operating System :: POSIX',
+        'Operating System :: Microsoft :: Windows',
+        'Operating System :: MacOS',
+        'Topic :: Multimedia :: Sound/Audio :: Capture/Recording',
+    ],
+)