Add shared Kubernetes configuration files

- Add k8s/configmap.yaml with shared environment variables
- Add k8s/lpt-secrets.yaml template (secrets not committed)
- Add k8s/regcred-secret.yaml template (managed by workflow)
- Add k8s/README.md with deployment instructions
- Remove incorrect deployment/service files from root k8s/

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

k8s/README.md

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+# Kubernetes Configuration for LPT Project
+
+This directory contains the shared Kubernetes configuration files for the LPT (Learning Progress Tracker) project.
+
+## Files
+
+### ConfigMap
+- **`configmap.yaml`** - Shared environment variables for all services
+  - LLM API configuration (URL, model, timeout)
+  - Database connection string
+  - Service URLs
+
+### Secrets (Templates)
+- **`lpt-secrets.yaml`** - Application secrets template
+  - LLM API key
+  - MySQL root password
+  - **⚠️ DO NOT commit real secrets!** Use the template to create secrets manually.
+
+- **`regcred-secret.yaml`** - Docker registry authentication template
+  - Used for pulling images from private registry (192.168.123.199:5000)
+  - **⚠️ Managed by Gitea Actions workflow** - DO NOT commit real credentials!
+
+### Service-Specific Configurations
+Each service has its own `k8s/` directory with deployment and service configs:
+- **`lpt-fe/k8s/`** - Frontend deployment (Nginx + Vue 3)
+- **`lpt-be/k8s/`** - Backend deployment (Spring Boot)
+- **`lpt-ai/k8s/`** - AI service deployment (Python FastAPI)
+
+## Deployment
+
+### Initial Setup
+
+1. **Create namespace**:
+   ```bash
+   kubectl create namespace lpt-dev
+   ```
+
+2. **Apply shared ConfigMap**:
+   ```bash
+   kubectl apply -f k8s/configmap.yaml
+   ```
+
+3. **Create secrets** (replace with actual values):
+   ```bash
+   # Application secrets
+   kubectl create secret generic lpt-secrets \
+     --from-literal=llm-api-key=<YOUR_LLM_API_KEY> \
+     --from-literal=mysql-root-password=<YOUR_MYSQL_ROOT_PASSWORD> \
+     --namespace=lpt-dev
+
+   # Registry credentials (for manual creation, or use Gitea workflow)
+   kubectl create secret docker-registry regcred \
+     --docker-server=192.168.123.199:5000 \
+     --docker-username=admin \
+     --docker-password=<REGISTRY_PASSWORD> \
+     --namespace=lpt-dev
+   ```
+
+4. **Deploy services**:
+   ```bash
+   # Frontend
+   kubectl apply -f lpt-fe/k8s/
+
+   # Backend
+   kubectl apply -f lpt-be/k8s/
+
+   # AI Service
+   kubectl apply -f lpt-ai/k8s/
+   ```
+
+### CI/CD Workflow
+
+The Gitea Actions workflows (`.gitea/workflows/deploy.yml` in each service) automatically:
+1. Build Docker images
+2. Push to private registry (192.168.123.199:5000)
+3. Create/update `regcred` secret with credentials from Gitea secrets
+4. Update deployment image tags
+
+**Required Gitea Secrets** (per repository):
+- `REGISTRY_USERNAME`: Docker registry username (admin)
+- `REGISTRY_PASSWORD`: Docker registry password
+
+## Verification
+
+Check deployment status:
+```bash
+kubectl get all -n lpt-dev
+kubectl get configmap -n lpt-dev
+kubectl get secret -n lpt-dev
+```
+
+View logs:
+```bash
+kubectl logs -f deployment/lpt-fe -n lpt-dev
+kubectl logs -f deployment/lpt-be -n lpt-dev
+kubectl logs -f deployment/lpt-ai -n lpt-dev
+```
+
+## Architecture
+
+```
+┌─────────────────┐
+│   lpt-fe:3000   │ (NodePort 30080)
+│   Vue 3 + Nginx │
+└────────┬────────┘
+         │
+         ▼
+┌─────────────────┐
+│   lpt-be:8080   │ (NodePort 30088)
+│   Spring Boot   │
+└────────┬────────┘
+         │
+         ├─────────► MySQL (external)
+         │
+         ▼
+┌─────────────────┐
+│  lpt-ai:5199    │ (ClusterIP)
+│  FastAPI        │
+└─────────────────┘
+         │
+         ▼
+   LLM API (external)
+```
+
+## Notes
+
+- **Namespace**: All resources use `lpt-dev` namespace
+- **Registry**: Private Docker registry at `192.168.123.199:5000`
+- **Image Pull**: All deployments use `imagePullSecrets: [name: regcred]`
+- **ConfigMap**: Shared config is mounted as environment variables
+- **Secrets**: Sensitive data (API keys, passwords) stored in `lpt-secrets`

k8s/configmap.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: lpt-config
+  namespace: lpt-dev
+data:
+  # LPT AI Service
+  LLM_API_URL: https://api.siliconflow.cn/v1/chat/completions
+  LLM_MODEL: Qwen/Qwen2.5-32B-Instruct
+  LLM_TIMEOUT_MS: "60000"
+  LPT_AI-SERVICE_URL: http://lpt-ai:5199
+  PORT: "5199"
+
+  # Spring Boot Database
+  SPRING_DATASOURCE_URL: jdbc:mysql://mysql:3306/learning_progress_tracker?allowPublicKeyRetrieval=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT%2B8

k8s/lpt-secrets.yaml

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+# LPT Application Secrets
+#
+# This file is a TEMPLATE - DO NOT commit real secrets to git!
+#
+# To create this secret:
+# kubectl create secret generic lpt-secrets \
+#   --from-literal=llm-api-key=<YOUR_LLM_API_KEY> \
+#   --from-literal=mysql-root-password=<YOUR_MYSQL_ROOT_PASSWORD> \
+#   --namespace=lpt-dev
+#
+# Or use kubectl apply with stringData:
+# kubectl apply -f - <<EOF
+# apiVersion: v1
+# kind: Secret
+# metadata:
+#   name: lpt-secrets
+#   namespace: lpt-dev
+# type: Opaque
+# stringData:
+#   llm-api-key: "your-actual-api-key"
+#   mysql-root-password: "your-actual-mysql-password"
+# EOF
+
+apiVersion: v1
+kind: Secret
+metadata:
+  name: lpt-secrets
+  namespace: lpt-dev
+type: Opaque
+data:
+  # Base64 encoded values - use stringData for plain text when applying
+  # llm-api-key: <base64-encoded-api-key>
+  # mysql-root-password: <base64-encoded-password>

k8s/regcred-secret.yaml

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+# Docker Registry Secret for pulling images from private registry
+#
+# This file is a TEMPLATE - the actual secret is managed by Gitea Actions workflow
+# and should NOT be committed with real credentials.
+#
+# To create this secret manually:
+# kubectl create secret docker-registry regcred \
+#   --docker-server=192.168.123.199:5000 \
+#   --docker-username=admin \
+#   --docker-password=<REGISTRY_PASSWORD> \
+#   --namespace=lpt-dev
+#
+# Or use the workflow which reads from Gitea secrets:
+# - REGISTRY_USERNAME
+# - REGISTRY_PASSWORD
+
+apiVersion: v1
+kind: Secret
+metadata:
+  name: regcred
+  namespace: lpt-dev
+type: kubernetes.io/dockerconfigjson
+data:
+  # .dockerconfigjson: <base64-encoded-docker-config>
+  # This is generated by the workflow - DO NOT commit real values here
+  .dockerconfigjson: ""