Fetch and load spdx licenses

[sanchitram1]

Integrate automatic SPDX license data fetching into the database initialization pipeline.

This ensures the licenses table is automatically populated with the latest SPDX license texts whenever the alembic service runs from a fresh start, providing up-to-date license information without manual intervention.

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PR-Codex overview

This PR introduces a new text field to the licenses table to store license content, adds a script to fetch SPDX licenses from GitHub, and updates migration scripts accordingly.

Detailed summary

• Added a text column to the licenses table in core/models/__init__.py.
• Created alembic/versions/20250821_2148-add_text_field_to_licenses_table.py for migration.
• Implemented fetch_spdx_licenses.py to retrieve SPDX licenses and generate SQL statements.
• Updated alembic/run_migrations.sh to include SPDX license fetching.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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