feat(portal): add core domain, use cases and HRID-to-UUID factory

[konrad-krol-incubly]

Issue

https://gravitee.atlassian.net/browse/EXT-134

Description

Context: First slice of the next-gen Portal feature for the Automation API — introduces the domain layer of the Portal resource so reviewers can absorb the model, contracts, and use cases in isolation before persistence or REST wiring lands.

Scope:

• Adds the Portal core model (entity + value-object id + not-found exception) and its CRUD service interface.
• Introduces four use cases covering create-or-update, get, delete, and default-portal seeding, fully covered by unit tests backed by an in-memory CRUD
  service.
• Extends the HRID-to-UUID factory with a deterministic portal() derivation used by the seed.
• No Spring wiring yet — the use cases ship without the framework annotation so the module boots green until persistence arrives in PR 2.

[gemini-code-assist]

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[dev-marek]

Please do some minor changes, but overall nice job

[sonarqubecloud]

Quality Gate passed for 'Gravitee.io APIM - Reporter'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[gemini-code-assist]

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