docs(agent): add rules and skills

.agent/rules/main.md

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+---
+trigger: always_on
+---
+
+# Project Context: University Schedule System
+
+## Project Overview
+This project is a university scheduling system website.
+- **Role**: Educational platform for managing schedules.
+- **Language**: Mixed (Java Backend + Web Frontend).
+- **Public URL**: https://magistr.zuev.company
+
+## Directory Structure & Responsibilities
+The project follows a specific folder structure. You must adhere to these paths:
+
+- **`backend/`**: Contains the **Java** backend application source code.
+  - When working on API or server logic, focus here.
+  
+- **`frontend/`**: Contains the frontend source code. Note the strict role separation:
+  - `frontend/admin/`: Code specific to the **Administrator** interface.
+  - `frontend/teacher/`: Code specific to the **Teacher** interface.
+  - `frontend/student/`: Code specific to the **Student** interface.
+  - *Constraint*: Do not mix logic between these folders unless creating a shared utility.
+
+- **`db/`**: Database configuration and data.
+  - `db/init/init.sql`: The SQL script responsible for **creating and initializing** the database schema (tables, initial data).
+  
+- **Root Files**:
+  - `compose.yaml`: The Docker Compose configuration. This file defines the services (backend, db, frontend servers) and how they run together.
+  - `.env`: Environment variables. Contains sensitive config (DB passwords, ports, API keys).
+
+## External Dependencies (Parent Directory)
+Some infrastructure components are located outside the project root:
+
+- **`../caddy-proxy/`**: Located one level up relative to the project root.
+  - **Role**: Reverse proxy handling traffic for `magistr.zuev.company`.
+  - **`Caddyfile`**: Configuration for routing and SSL.
+  - **`compose.yaml`**: A separate Docker Compose file specifically for the proxy service.
+
+## Workflow Guidelines
+1. **Database Changes**: If you need to modify the database schema, you must update `db/init/init.sql` so the changes persist when the container is rebuilt.
+2. **Configuration**: If adding new configuration parameters, add them to `.env` and reference them in `compose.yaml` or the application code.
+3. **Routing/Proxy**: If there are issues with the domain or external access, check the configuration in `../caddy-proxy/Caddyfile`.
+
+## Language Preference
+- **Always answer in Russian**: This is a strict requirement from the user. All explanations, comments, and interactions must be in Russian unless specifically asked otherwise.