docs: full postgres documentation rewrite — sub-field tables, working HCL examples for create/modify/user/database

docs/30_registry/resources/postgres_user.md

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+# Resource nubes_postgres_user
+
+Service: `nubes_postgres` (ID: 90)
+
+[PostgreSQL (основной)](postgres.md) | [Operations](postgres_ops.md) | [User](postgres_user.md) | [Example](postgres_user_example.md)
+
+## Create params
+
+**Обязательные параметры**
+
+<table class="resource-table resource-table-compact resource-table-required">
+<thead><tr><th>ID</th><th>Code</th><th>Type</th><th>Description</th><th>Constraints</th></tr></thead>
+<tbody>
+<tr><td>733</td><td><strong><code class="code-no-wrap">username</code></strong></td><td><code>string</code></td><td></td><td>regex=^[A-Za-z0-9]+$; maxlength=62; minlength=2</td></tr>
+<tr><td>740</td><td><strong><code class="code-no-wrap">role</code></strong></td><td><code>string</code></td><td>`app_user` — стандартный пользователь с базовым набором прав<br/>`ddl_user` — пользователь с расширенными правами, включая управление ролями и базами данных</td><td>value_list=app_user, ddl_user</td></tr>
+</tbody></table>
+
+## Delete params
+
+<table class="resource-table resource-table-compact resource-table-required">
+<thead><tr><th>ID</th><th>Code</th><th>Type</th><th>Description</th><th>Constraints</th></tr></thead>
+<tbody>
+<tr><td>739</td><td><strong><code class="code-no-wrap">username</code></strong></td><td><code>string</code></td><td>Пример: `username-admin`</td><td></td></tr>
+</tbody></table>