fix: API install prisma+generate in pruned, AI use absolute cargo path

- API: npm install prisma @prisma/client in pruned dir before generate
- AI: use /root/.cargo/bin/cargo directly, install underthesea with --no-build-isolation

Co-Authored-By: Claude Opus 4 (1M context) <noreply@anthropic.com>

libs/ai-services/Dockerfile

@@ -6,17 +6,20 @@ WORKDIR /app
 RUN apt-get update && \
     apt-get install -y --no-install-recommends gcc g++ dumb-init curl && \
     curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain stable --profile minimal && \
-    rm -rf /var/lib/apt/lists/*
+    rm -rf /var/lib/apt/lists/* && \
+    echo 'export PATH="/root/.cargo/bin:$PATH"' >> /etc/profile.d/cargo.sh
+ENV PATH="/root/.cargo/bin:${PATH}"
 
 COPY pyproject.toml .
-RUN . /root/.cargo/env && \
-    pip install --no-cache-dir maturin && \
+# Install maturin first, then deps with --no-build-isolation for packages needing Rust
+RUN /root/.cargo/bin/cargo --version && \
+    pip install --no-cache-dir maturin setuptools wheel && \
+    pip install --no-cache-dir --no-build-isolation "underthesea==6.8.0" && \
     (pip install --no-cache-dir . 2>/dev/null || pip install --no-cache-dir \
     "fastapi==0.115.0" \
     "uvicorn[standard]==0.32.0" \
     "xgboost==2.1.0" \
     "numpy==1.26.4" \
-    "underthesea==6.8.0" \
     "pydantic==2.9.0" \
     "pydantic-settings==2.5.0" \
     "httpx==0.27.0" \