Bugfix/unmatched path returns 404

[weited]

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[Copilot]

Pull request overview

This PR addresses incorrect error handling for unmatched routes (returning 500 instead of 404) and introduces request-path normalization so trailing slashes don’t break handler resolution under Spring Boot 3 (e.g., when a proxy appends /).

Changes:

• Add a NoResourceFoundException handler in GlobalExceptionHandler to return 404 for unmapped paths/resources.
• Introduce TrailingSlashNormalizationFilter to strip trailing slashes for application endpoints while excluding framework-managed paths (springdoc + actuator).
• Add/extend tests to assert 404 behavior for unmatched paths and validate trailing-slash normalization behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
src/main/java/au/org/aodn/oceancurrent/exception/GlobalExceptionHandler.java	Adds a dedicated 404 handler for NoResourceFoundException to avoid the catch-all mapping these cases to 500.
src/main/java/au/org/aodn/oceancurrent/configuration/TrailingSlashNormalizationFilter.java	Adds a highest-precedence filter to normalize trailing slashes while skipping swagger/api-docs/webjars/actuator routes.
src/test/java/au/org/aodn/oceancurrent/controller/ImageMetadataControllerTest.java	Adds a regression test ensuring unmatched paths return 404.
src/test/java/au/org/aodn/oceancurrent/configuration/TrailingSlashNormalizationFilterTest.java	Adds unit tests for trailing-slash normalization and excluded paths.

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