fix: update issuer URL handling in server metadata loading

[nanderstabel]

Description of change

Different endpoints in Credential Issuer, and Authorization Server Metadata were not updated when the Public URL is updated. This PR fixes that and ensures that this always happens during initialization.

Links to any relevant issues

• Two OID4VCI interop gaps in ssi-agent 1.0.0-beta.17 (issuer metadata + credential request shape) #336 (comment)

How the change has been tested

n/a

Definition of Done checklist

Add an x to the boxes that are relevant to your changes.

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have successfully tested this change in a docker environment

[codecov-commenter]

Codecov Report

❌ Patch coverage is 30.00000% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
agent_issuance/src/server_config/aggregate.rs	0.00%	7 Missing ⚠️

Files with missing lines	Coverage Δ
agent_issuance/src/state.rs	43.60% <100.00%> (ø)
agent_issuance/src/server_config/aggregate.rs	46.09% <0.00%> (-1.17%)	⬇️

... and 58 files with indirect coverage changes

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