feat: Add support for Apache Airflow, ArgoCD, Jenkins, and Nexus with corresponding configurations

- Added Apache Airflow with Makefile, README, and values.yaml for deployment.
- Introduced ArgoCD with Makefile, README, and values.yaml for GitOps management.
- Implemented Jenkins with Makefile, README, and values.yaml for CI/CD automation.
- Included Nexus Repository Manager with Makefile, README, and values.yaml for artifact management.
- Updated Gitea and Vault configurations for consistency and improved documentation.
- Enhanced README files with installation instructions, usage, and configuration details in both English and Chinese.

src/argocd/README.md

@@ -0,0 +1,43 @@
+# ArgoCD
+
+## Introduction
+
+ArgoCD is a declarative, GitOps continuous delivery tool for Kubernetes. It follows the GitOps pattern of using Git repositories as the source of truth for defining the desired application state.
+
+## Installation
+
+To install ArgoCD, run:
+
+```bash
+make install
+```
+
+Default credentials:
+
+- Username: `admin`
+- Password: `admin`
+
+## Usage
+
+After installation, access ArgoCD:
+
+```bash
+# Port forward to access UI
+kubectl port-forward svc/argocd-server -n argocd 8080:443
+
+# Get admin password
+kubectl get secret argocd-initial-admin-secret -n argocd -o jsonpath="{.data.password}" | base64 -d
+```
+
+Then open <https://localhost:8080> in your browser.
+
+## Configuration
+
+The default configuration includes:
+
+- Single Redis instance
+- Single controller replica
+- Single repo server
+- Dex enabled for SSO
+
+For production, consider enabling HA mode with multiple replicas.