feat: add Docker, Drone CI, and k8s deployment manifests

- Dockerfile for Python 3.12 FastAPI app
- Drone CI pipeline to build and push to internal registry
- Kubernetes manifests (Deployment, Service, Secret, Namespace)
- ArgoCD Application for GitOps deployment
- Kustomize base configuration

Dockerfile

@@ -0,0 +1,22 @@
+FROM python:3.12-slim AS base
+
+WORKDIR /app
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends gcc g++ && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY pyproject.toml ./
+
+RUN pip install --no-cache-dir . && \
+    pip install --no-cache-dir openbb-quantitative openbb-econometrics openbb-technical && \
+    apt-get purge -y gcc g++ && \
+    apt-get autoremove -y
+
+COPY *.py ./
+
+EXPOSE 8000
+
+USER nobody
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]