feat: 初始化病虫害以图搜图应用

- 基于 CLIP 模型实现图片相似度搜索（app.py / main.py）
  - 新增 Streamlit 可视化交互界面
  - 新增 pyproject.toml、justfile、Dockerfile 项目配置
  - 补充完整 README 文档（功能介绍、快速开始、Docker 部署）
  - 新增 .gitignore

justfile

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+# Justfile for pest-image-search 病虫害以图搜图
+# Use `just <command>` to run tasks
+
+# Default task: show available commands
+default:
+    just --list
+
+# Run the Streamlit app
+run:
+    uv run streamlit run app.py
+
+# Install dependencies
+install:
+    uv add streamlit ruff plotly requests pillow numpy torch transformers
+
+# Format code with ruff
+format:
+    uv run ruff format .
+
+# Check code with ruff
+check:
+    uv run ruff check .
+
+# Run all checks and formatting
+lint:
+    just format && just check
+
+# Clean up cache files
+clean:
+    rm -rf __pycache__ .ruff_cache .streamlit_cache