Add urgency (-1/0/1) to melding

[joeyamst]

Implements urgency selection on meldingen (values: -1, 0, 1).

• Adds column + check constraint + migration
• Exposes in create/update/retrieve/list endpoints
• Adds/updates tests for defaulting, validation, and PATCH behavior

[Copilot]

Pull request overview

Adds an urgency attribute to meldingen (allowed values -1/0/1) and wires it through persistence, API I/O, and tests so callers can set it and get it back consistently.

Changes:

• Add urgency column + DB check constraint (and SQLAlchemy model constraint) with default 0.
• Expose urgency in API create/update responses and in the output schema.
• Extend endpoint tests/fixtures to cover defaulting, validation, and PATCH semantics (keep existing urgency when omitted).

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/api/v1/endpoints/test_melding.py	Adds assertions and new cases covering default urgency, allowed values, and PATCH behavior.
tests/api/v1/endpoints/conftest.py	Extends the melding fixture with an optional melding_urgency param to support new tests.
migrations/versions/7a9f5e2e9d1b_melding_urgency.py	Adds urgency column with default + check constraint and supports downgrade.
meldingen/schemas/output_factories.py	Includes urgency in create/update/retrieve/list output construction.
meldingen/schemas/output.py	Adds urgency to the API output schema.
meldingen/schemas/input.py	Adds urgency to the API input schema with default and constrained values.
meldingen/models.py	Adds the ORM column and check constraint for urgency.
meldingen/api/v1/endpoints/melding.py	Uses exclude_unset=True when dumping input, enabling PATCH to avoid overwriting existing urgency when omitted.

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