Feature/enhance activity logging

[pikann]

This pull request introduces comprehensive CI workflows for the backend, frontend, and MCP components, and adds detailed activity recording for checklist and checklist item operations in the backend. It also updates dependencies and increments the plugin version.

CI/CD automation:

• Adds .github/workflows/backend-pr-ci.yml to run lint, build (including WASM), and tests with coverage for backend changes.
• Adds .github/workflows/frontend-pr-ci.yml to typecheck and build the frontend using Bun.
• Adds .github/workflows/mcp-pr-ci.yml to typecheck and build the MCP server using Bun.

Backend feature enhancements:

• Adds calls to plugin.RecordActivity in backend/checklists.go and backend/items.go to log creation, update, and deletion of checklists and checklist items, including relevant details such as titles, changes, and descriptions. [1] [2] [3] [4] [5] [6] [7] [8]

Dependency and metadata updates:

• Updates the plugin SDK dependency to v0.2.0-rc.5 in backend/go.mod.
• Bumps plugin version to 0.2.1 in plugin.json.

[Copilot]

Pull request overview

This PR adds activity logging for checklist and checklist-item CRUD operations in the backend, and introduces PR-scoped CI workflows for backend, frontend, and MCP components, alongside a plugin SDK update and plugin version bump.

Changes:

• Added plugin.RecordActivity calls for create/update/delete actions on checklists and checklist items.
• Added GitHub Actions PR CI workflows for backend (lint/build/test+coverage), frontend (typecheck/build via Bun), and MCP (typecheck/build via Bun).
• Updated backend plugin SDK dependency and bumped plugin.json version.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
plugin.json	Bumps plugin version metadata to 0.2.1.
backend/items.go	Records activity events for checklist item create/update/delete; includes change-list construction on updates.
backend/checklists.go	Records activity events for checklist create/update/delete (including pre-delete title lookup).
backend/go.mod	Updates github.com/Paca-AI/plugin-sdk-go requirement to v0.2.0-rc.5.
backend/go.sum	Updates checksums to match the new plugin SDK version.
.github/workflows/backend-pr-ci.yml	Adds backend PR CI (golangci-lint, WASM build, race+coverage tests).
.github/workflows/frontend-pr-ci.yml	Adds frontend PR CI (Bun install, typecheck, production build).
.github/workflows/mcp-pr-ci.yml	Adds MCP PR CI (Bun install, typecheck, build).

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