refactor(api): replace com.fasterxml.jackson with tools.jackson (Jackson 2 to Jackson 3 namespace.)

[balazs-szucs]

Description of Changes

Should yield no behavioral change. Please use Jackson 3 namespace NOT Jackson 2. We only pulling Jackson transitively, it would be nice once everything settles to migrate fully to Jackson 3 with nothing pulling in Jackson 2, still no reason to use Jackson 2.

Changes:

• Updated catch blocks from JsonProcessingException to JacksonException, since Jackson 3 removes the former in favor of the latter (now unchecked, extends RuntimeException).
• Verified no ObjectMapper post-construction mutation call sites remain (Jackson 3's mapper is immutable/builder-based).
• Some transitive dependencies (e.g. Stripe, Keygen, Jinja and so on.) still pull Jackson 2 but not much we can do there.

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Checklist

General

• I have read the Contribution Guidelines
• I have read the Stirling-PDF Developer Guide (if applicable)
• I have read the How to add new languages to Stirling-PDF (if applicable)
• I have performed a self-review of my own code
• My changes generate no new warnings

Documentation

• I have updated relevant docs on Stirling-PDF's doc repo (if functionality has heavily changed)
• I have read the section Add New Translation Tags (for new translation tags only)

Translations (if applicable)

• I ran scripts/counter_translation.py

UI Changes (if applicable)

• Screenshots or videos demonstrating the UI changes are attached (e.g., as comments or direct attachments in the PR)

Testing (if applicable)

• I have run task check to verify linters, typechecks, and tests pass
• I have tested my changes locally. Refer to the Testing Guide for more details.

[Copilot]

Pull request overview

Refactors selected SaaS + proprietary Java classes to use the Jackson 3 tools.jackson.* namespace (instead of com.fasterxml.jackson.*), including updating exception handling to JacksonException, in line with the repo’s Jackson 3 migration direction.

Changes:

• Switched ObjectMapper / JsonNode imports from com.fasterxml.jackson.* to tools.jackson.* in multiple controllers/services/tests.
• Replaced JsonProcessingException catch blocks with JacksonException where JSON (de)serialization is handled.
• Updated supporting JSON utilities (e.g., JPA converter and Valkey job store) to the tools.jackson.* types.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
app/saas/src/test/java/stirling/software/saas/payg/entitlement/EntitlementGuardTest.java	Updates test imports to tools.jackson (ObjectMapper, JsonNode).
app/saas/src/main/java/stirling/software/saas/procurement/service/ProcurementService.java	Uses tools.jackson and updates serialization exception catch to JacksonException.
app/saas/src/main/java/stirling/software/saas/procurement/license/KeygenEnterpriseLicenseService.java	Switches JSON types to tools.jackson namespace.
app/saas/src/main/java/stirling/software/saas/procurement/legal/AgreementAssembler.java	Switches ObjectMapper import to tools.jackson.
app/saas/src/main/java/stirling/software/saas/procurement/api/ProcurementController.java	Switches ObjectMapper import to tools.jackson.
app/saas/src/main/java/stirling/software/saas/payg/entitlement/EntitlementGuard.java	Switches ObjectMapper import to tools.jackson.
app/saas/src/main/java/stirling/software/saas/legal/LegalDocumentRegistry.java	Switches JSON types to tools.jackson namespace.
app/saas/src/main/java/stirling/software/saas/billing/service/StripeUsageReportingService.java	Switches ObjectMapper import to tools.jackson.
app/saas/src/main/java/stirling/software/saas/ai/controller/AiCreateInternalController.java	Switches to tools.jackson and updates JSON error handling to JacksonException.
app/saas/src/main/java/stirling/software/saas/ai/controller/AiCreateController.java	Switches to tools.jackson and updates JSON error handling to JacksonException.
app/proprietary/src/main/java/stirling/software/proprietary/workflow/util/WorkflowMapper.java	Switches ObjectMapper import to tools.jackson.
app/proprietary/src/main/java/stirling/software/proprietary/workflow/controller/SigningSessionController.java	Switches ObjectMapper import to tools.jackson.
app/proprietary/src/main/java/stirling/software/proprietary/storage/converter/JsonMapConverter.java	Switches JSON types to tools.jackson and updates exception handling to JacksonException.
app/proprietary/src/main/java/stirling/software/proprietary/cluster/valkey/ValkeyJobStore.java	Switches JSON types to tools.jackson and updates exception handling to JacksonException.

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