Add plugin framework and settings UI

packages/plugins/create-paperclip-plugin/README.md

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+# @paperclipai/create-paperclip-plugin
+
+Scaffolding tool for creating new Paperclip plugins.
+
+```bash
+npx @paperclipai/create-paperclip-plugin my-plugin
+```
+
+Or with options:
+
+```bash
+npx @paperclipai/create-paperclip-plugin @acme/my-plugin \
+  --template connector \
+  --category connector \
+  --display-name "Acme Connector" \
+  --description "Syncs Acme data into Paperclip" \
+  --author "Acme Inc"
+```
+
+Supported templates: `default`, `connector`, `workspace`  
+Supported categories: `connector`, `workspace`, `automation`, `ui`
+
+Generates:
+- typed manifest + worker entrypoint
+- example UI widget using `@paperclipai/plugin-sdk/ui`
+- test file using `@paperclipai/plugin-sdk/testing`
+- `esbuild` and `rollup` config files using SDK bundler presets
+- dev server script for hot-reload (`paperclip-plugin-dev-server`)
+
+## Workflow after scaffolding
+
+```bash
+cd my-plugin
+pnpm install
+pnpm dev       # watch worker + manifest + ui bundles
+pnpm dev:ui    # local UI preview server with hot-reload events
+pnpm test
+```