refactor: extract reusable Prefect+OSW utils from examples

[simontaurus]

• Add ConnectionSettings, connect(), WorkflowRequest, and register_flow() to osw.utils.workflow for reuse across Prefect workflows
• register_flow() creates Software + PrefectFlow entities on OSW, cleans up stale deployments, and writes usage snippet to wiki page
• Integrate OSW registration into deploy() via optional osw parameter
• Simplify hello_world.py to use workflow utils instead of inline code
• Add opensemantic.base to dependencies

[coveralls]

Coverage Report for CI Build 25096754496

Coverage decreased (-0.5%) to 52.582%

Details

• Coverage decreased (-0.5%) from the base build.
• Patch coverage: 74 uncovered changes across 2 files (36 of 110 lines covered, 32.73%).
• 1 coverage regression across 1 file.

Uncovered Changes

File	Changed	Covered	%
src/osw/utils/workflow.py	106	33	31.13%
src/osw/core.py	3	2	66.67%

Coverage Regressions

1 previously-covered line in 1 file lost coverage.

File	Lines Losing Coverage	Coverage
src/osw/wiki_tools.py	1	25.86%

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Coverage Stats

Relevant Lines:	5888
Covered Lines:	3298
Line Coverage:	56.01%
Relevant Branches:	1276
Covered Branches:	469
Branch Coverage:	36.76%
Branches in Coverage %:	Yes
Coverage Strength:	3.31 hits per line

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💛 - Coveralls