fix: hard delete spools via Spoolman API

[fazerize]

Summary

• Change Spoolman-compatible DELETE /spool/{id} to permanently delete the FilaMan spool instead of only archiving it
• Keep the existing Spoolman-compatible endpoint and success response
• Document the permanent delete semantics and bump plugin version to 1.1.9

Verification

• python3 -m compileall spoolmanapi
• git diff --check

[Copilot]

Pull request overview

This PR updates the Spoolman-compatible API implementation so that deleting a spool via DELETE /spool/{id} performs a true database delete (rather than archiving), while keeping the existing endpoint shape and success response. It also documents the new semantics and bumps the plugin version.

Changes:

• Change spool deletion behavior to hard-delete the spool record and emit a deleted event.
• Document that DELETE /spool/{id} is a permanent delete.
• Bump plugin version from 1.1.8 to 1.1.9.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
spoolmanapi/service.py	Switches delete_spool from “archive” to db.delete() + commit while keeping the same API contract.
spoolmanapi/plugin.json	Version bump to 1.1.9 to reflect behavior change.
README.md	Updates endpoint description and adds a “Delete semantics” section clarifying permanent deletion.

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