docs: add Contributing page, no-PR policy, link from sidebar

apps/docs/.vitepress/config.mts

@@ -75,6 +75,7 @@ export default defineConfig({
           { text: "Docker tags", link: "/guide/docker-tags" },
           { text: "Developer guide", link: "/guide/developer" },
           { text: "Translation guide", link: "/guide/translations" },
+          { text: "Contributing", link: "/guide/contributing" },
         ],
       },
       {

apps/docs/guide/contributing.md

@@ -0,0 +1,25 @@
+# Contributing
+
+Thanks for your interest in ashim. Community feedback helps shape the project, and there are several ways to get involved.
+
+## How to contribute
+
+The best way to contribute is through [GitHub Issues](https://github.com/ashim-hq/ashim/issues):
+
+- **Bug reports** - Found something broken? Open a bug report with steps to reproduce, your Docker setup, and what you expected to happen.
+- **Feature requests** - Have an idea for a new tool or improvement? Describe the problem you want solved and why it matters to you.
+- **Feedback** - Thoughts on the UI, workflow, documentation, or anything else? We want to hear it.
+
+## Pull requests
+
+We do not accept pull requests. All development is handled internally to maintain architectural consistency and code quality across the project.
+
+If you have found a bug, open an issue describing it rather than submitting a fix. If you have a suggestion for how something should work, describe it in a feature request. Your input is valuable even without a code contribution.
+
+## Forking
+
+You are welcome to fork the project for your own use under the terms of the [AGPLv3 license](https://github.com/ashim-hq/ashim/blob/main/LICENSE). The [Developer Guide](/guide/developer) covers setup, architecture, and how to add new tools.
+
+## Security
+
+If you discover a security vulnerability, please report it privately through [GitHub Security Advisories](https://github.com/ashim-hq/ashim/security/advisories/new) rather than opening a public issue.