[8.2] sitemanage Xlint residual after unchecked batch (#2032 / #2895) #2980

Parent / tracker: #2200
Slice of: #2032 (sitemanage Xlint)
After: #2895 / PR #2979 (unchecked/rawtypes cleared)
Also after: #2870 batch 3 serial-field collections (PR #2896)

Role

Next PR-sized residual for projects/sitemanage main-source -Xlint after unchecked/rawtypes cleanup.

Dominant remaining clusters (from live inventory after #2895)

1. this-escape (~55) — constructor patterns calling overridable methods / registering listeners. Prefer real init-order fixes or targeted suppress with justification.
2. serial-field residual (~14 non-collection after batch 3 merges) — nested non-serializable types on DTOs. Prefer real Serializable types or justified transient.
3. misc other (~33) — static qualification, equals/hashCode, Hibernate Session.get deprecation, fall-through, redundant cast, etc. Coherent small packages OK if grouped.
4. Test-source Xlint — separate batch if main residual still large.

Constraints

• Prefer real init-order / type fixes; preserve Spring/test wiring types exactly
• Do not touch rest API contracts unless forced
• Avoid mega-refactors; one PR-sized cluster (~30–80 warnings or one coherent package set)
• cd projects/sitemanage && ../../mvnw.cmd clean install must stay green
• If more than one PR remains after this slice, file another residual child

Leave unassigned.

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