Fix CLI crash when database not initialized

[seapagan]

Summary

Fixes CLI crash when database is not initialized. Commands now display a helpful error message directing users to run api-admin db init instead of crashing with SQL errors.

Changes

• Added is_database_initialized() helper function in app/database/helpers.py
• Added database initialization checks to all user commands: create, list, show, search, verify, ban, admin, delete
• Added checks to db populate and seed commands
• Added comprehensive test coverage (100%)
• Parameterized similar tests to reduce duplication

Test Coverage

• 472 tests passing
• 100% code coverage
• 13 new tests added (3 unit tests, 10 integration tests)
• Parameterized 7 similar tests into 1

Before

$ api-admin user list
(crashes with SQL error about missing alembic_version table)

After

$ api-admin user list

-> ERROR: Database has not been initialized.
Please run 'api-admin db init' to initialize the database first.

🤖 Generated with Claude Code

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (c144a82)	1676	1676	100.00%
Head commit (45211bf)	1704 (+28)	1704 (+28)	100.00% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#791)	29	29	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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