docs: add project documentation and update README
- Add `agent.md`: Complete maintenance reference covering project structure, API interactions, data flow, configuration, security, and operational procedures. - Add `architecture.md`: High-level architecture overview including component map, data flow, design decisions, and security model. - Update `README.md`: Add Apprise support documentation, manual deployment instructions, updated installation steps (bot admin requirement), and expanded payload mapping and troubleshooting sections. - Improve `lib/Controller/WebhookController.php`: Enhance `saveBotPassword` validation to check for missing fields and validate the password content. - Improve `lib/Service/TalkService.php`: Add `validateBotPassword` method for round-trip encryption testing and integrate it into `saveConfig`. - Update `css/adminSettings.css`: Add styles for the new `.nc-app-frame` wrapper. - Update `templates/adminSettings.php`: Refactor UI structure to use `.nc-app-frame` and improve layout of settings sections.
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