fix: remove China mirrors, add build-essential for voice-service

Server is on HK network, no need for China mirrors. Added
build-essential for compiling native Python packages (kokoro, etc).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

it0-web-admin/Dockerfile

@@ -4,7 +4,7 @@ FROM node:18-alpine AS builder
 WORKDIR /app
 
 COPY package.json package-lock.json ./
-RUN npm config set registry https://registry.npmmirror.com && npm ci
+RUN npm ci
 
 COPY . .
 

packages/services/voice-service/Dockerfile

@@ -6,10 +6,11 @@ WORKDIR /app
 RUN apt-get update && apt-get install -y \
     ffmpeg \
     libsndfile1 \
+    build-essential \
     && rm -rf /var/lib/apt/lists/*
 
 COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt -i https://pypi.tuna.tsinghua.edu.cn/simple
+RUN pip install --no-cache-dir -r requirements.txt
 
 COPY src/ ./src/