feat: add required id field to ServiceInfo

[mortenoh]

Summary

• Add required id field to ServiceInfo with slug format validation
• Service ID is now sent to orchestrator during registration, making registration idempotent
• Update all examples and documentation to include the new id field

Changes

ServiceInfo

• New required id field with slug format validation (^[a-z][a-z0-9]*(-[a-z0-9]+)*$)
• Valid formats: my-service, chap-ewars, prediction-service
• Invalid formats: My-Service (uppercase), my_service (underscore), 1-service (starts with number)

Registration

• Registration payload now includes id field from ServiceInfo
• Service ID is used for keepalive/deregister URLs instead of orchestrator-assigned ULID
• Makes registration idempotent - re-registering updates existing entry

Version

• Bump version to 0.8.0

BREAKING CHANGE

All existing ServiceInfo usages must add the id field:

# Before
ServiceInfo(display_name="My Service")

# After
ServiceInfo(id="my-service", display_name="My Service")

Test plan

• All existing tests pass (make test)
• All linting passes (make lint)
• New validation tests for id format
• Examples updated and verified

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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