docs: add Kreuzberg opencode plugins

data/plugins/kreuzberg.yaml

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+name: Kreuzberg
+repo: https://github.com/kreuzberg-dev/plugins
+tagline: Local document extraction for 91+ formats
+description: OpenCode plugin exposing kreuzberg CLI tools for document extraction, MIME detection, and supported-format discovery.
+scope:
+  - global
+  - project
+tags:
+  - documents
+  - extraction
+  - ocr
+  - cli
+homepage: https://www.npmjs.com/package/@kreuzberg/opencode-kreuzberg
+installation: |
+  Add the package to `opencode.json`:
+
+  ```json
+  {
+    "plugin": ["@kreuzberg/opencode-kreuzberg"]
+  }
+  ```
+
+  Requires the `kreuzberg` CLI.

data/plugins/kreuzcrawl.yaml

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+name: Kreuzcrawl
+repo: https://github.com/kreuzberg-dev/plugins
+tagline: Web crawling and scraping tools for opencode
+description: OpenCode plugin exposing kreuzcrawl CLI tools for scraping pages, crawling sites, and mapping URLs to JSON or Markdown.
+scope:
+  - global
+  - project
+tags:
+  - crawling
+  - scraping
+  - markdown
+  - cli
+homepage: https://www.npmjs.com/package/@kreuzberg/opencode-kreuzcrawl
+installation: |
+  Add the package to `opencode.json`:
+
+  ```json
+  {
+    "plugin": ["@kreuzberg/opencode-kreuzcrawl"]
+  }
+  ```
+
+  Requires the `kreuzcrawl` CLI.