docs: add missing @Operation and @Tag to 3 REST interfaces

[ginccc]

Summary

Three REST interfaces are missing core OpenAPI annotations that all other REST endpoints have.

What to add

Interface	File	What's missing
IRestUserConversationStore	engine/triggermanagement/IRestUserConversationStore.java	@Operation on all 3 methods
IRestHtmlChatResource	ui/IRestHtmlChatResource.java	@Operation on both methods
ILogoutEndpoint	engine/api/ILogoutEndpoint.java	@Tag class-level annotation (methods already have @Operation)

Pattern

@Operation — add a summary field:

@Operation(summary = "Read user conversation", description = "...")

@Tag:

@Tag(name = "Authentication")

Tags should match an entry in src/main/java/ai/labs/eddi/configs/OpenApiConfig.java. If no matching tag exists, add one there too.

Verify before starting: Confirm these annotations are still missing — the codebase may have been updated since this issue was filed.

Acceptance criteria

• IRestUserConversationStore: all 3 methods have @Operation
• IRestHtmlChatResource: both methods have @Operation
• ILogoutEndpoint: has class-level @Tag
• ./mvnw compile passes

[ded-furby]

I can take this issue and will add the requested OpenAPI annotations with a focused update, then push a PR.