feat: add Meta.db_table alias for table name

[waketzheng]

Description

Add Meta.db_table as an alias for Meta.table when configuring model table names.

This change allows:

• table = "custom_table"
• db_table = "custom_table"
• both table and db_table when they have the same value

If both options are set with different values, model creation raises ConfigurationError.

The model documentation has also been updated to mention db_table.

Motivation and Context

Users coming from Django often expect Meta.db_table to customize the database table name. Previously, Tortoise ORM only recognized Meta.table, so db_table was silently ignored.

Supporting db_table makes the behavior friendlier for Django users while keeping the existing table option fully backward compatible.

How Has This Been Tested?

Tested on Windows with Python 3.14.3.

Commands run:

uv run --frozen --group test pytest tests/test_table_name.py
uv run --frozen ruff check tortoise tests

tests/test_table_name.py now covers:

• Meta.table still taking precedence over the global table name generator
• Meta.db_table working as a table name override
• matching Meta.table and Meta.db_table
• conflicting Meta.table and Meta.db_table raising ConfigurationError

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added the changelog accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codspeed-hq]

Merging this PR will not alter performance

✅ 24 untouched benchmarks

---

_{Comparing waketzheng:support-db-table (d3e11fd) with develop (179ea6f)}