docs(readme): reorganize docs and screenshot gallery

Align project docs with current behavior using progressive disclosure and bilingual deep-dive guides. Add per-page admin screenshots with consistent page-* naming to make UI documentation clearer.

docs/deployment.zh-CN.md

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+# 部署指南
+
+## Docker
+
+```bash
+docker build -t gitea-assistant .
+docker run -d -p 5174:5174 -v ./data:/app/data -e PORT=5174 gitea-assistant
+```
+
+## Docker Compose
+
+```bash
+docker compose up -d
+```
+
+`docker-compose.yml` 默认包含：
+
+- `gitea-assistant`
+- `qdrant`
+
+如果不使用记忆能力，可在自定义编排中将 Qdrant 设为可选。
+
+## Kubernetes
+
+Kubernetes 清单位于 `k8s/` 目录。
+
+### 1) 创建命名空间与加密密钥
+
+```bash
+kubectl apply -f k8s/namespace.yaml
+ENCRYPTION_KEY=$(openssl rand -hex 32)
+kubectl -n gitea-assistant create secret generic gitea-assistant-secret \
+  --from-literal=ENCRYPTION_KEY=$ENCRYPTION_KEY
+```
+
+### 2) 部署
+
+```bash
+kubectl apply -k k8s/
+```
+
+或逐个应用：
+
+```bash
+kubectl apply -f k8s/namespace.yaml
+kubectl apply -f k8s/qdrant.yaml
+kubectl apply -f k8s/gitea-assistant.yaml
+```
+
+### 3) 验证
+
+```bash
+kubectl -n gitea-assistant get pods
+kubectl -n gitea-assistant get svc
+```
+
+### 4) 对外暴露（可选）
+
+```bash
+kubectl -n gitea-assistant patch svc gitea-assistant -p '{"spec":{"type":"NodePort"}}'
+```