fix(docker): set relative API base URL and pin numpy for ChromaDB compat

Dockerfile

@@ -7,6 +7,7 @@ COPY frontend/package.json frontend/package-lock.json ./
 RUN npm ci
 
 COPY frontend/ ./
+ENV VITE_API_BASE_URL=/api/v1
 RUN npm run build
 
 # Stage 2: Production runtime

backend/requirements.txt

@@ -3,6 +3,7 @@ uvicorn[standard]==0.27.0
 pydantic==2.5.3
 pydantic-settings==2.1.0
 chromadb==0.4.22
+numpy<2.0
 python-docx==1.1.0
 pypdf==4.0.2
 python-dotenv==1.0.0