fix: all 3 Dockerfiles — Prisma copy, standalone paths, maturin PATH

- API: copy .prisma + @prisma into pruned node_modules, restore dist/prisma COPY
- Web: fix standalone paths for monorepo (node_modules + apps/web/server.js)
- AI: source cargo env in same RUN layer, wrap fallback pip install in subshell

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

libs/ai-services/Dockerfile

@@ -7,11 +7,11 @@ 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/*
-ENV PATH="/root/.cargo/bin:${PATH}"
 
 COPY pyproject.toml .
-RUN pip install --no-cache-dir maturin && \
-    pip install --no-cache-dir . 2>/dev/null || pip install --no-cache-dir \
+RUN . /root/.cargo/env && \
+    pip install --no-cache-dir maturin && \
+    (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" \
@@ -20,7 +20,7 @@ RUN pip install --no-cache-dir maturin && \
     "pydantic==2.9.0" \
     "pydantic-settings==2.5.0" \
     "httpx==0.27.0" \
-    "slowapi==0.1.9"
+    "slowapi==0.1.9")
 
 COPY app/ ./app/