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Adds a checkbox to the TaskView filter panel that, when checked,
attaches completion_percent_lte=99 to the /api/tasks/ query — i.e.
tasks with completion_percent < 100% (not_started + in_progress).

Bug fix: TaskView.fetchTasks built its query inline and bypassed
useTaskFilters.toApiParams(), so any future field added to the
composable's params mapping would silently no-op. Route the call
through toApiParams() to make the composable the single source of
truth.

Coverage: extend useTaskFilters.spec toApiParams suite with both
branches of onlyIncomplete.
Co-Authored-By: Claude <noreply@anthropic.com>

No semantic changes. Trailing commas in object literals, paren-spaced
arrow params, line wrapping at column 80. Mirrored across en + zh-CN.
Co-Authored-By: Claude <noreply@anthropic.com>

Task images were stored as a JSON-ish field on stdt_tasks. Spec 0004 (see
docs/task-images-migration.md) splits them into a dedicated sub-resource
stdt_task_images so each image is its own row with mime_type / file_name /
etag / size_bytes, accessed via /api/tasks/<id>/images/.

Frontend changes:
- new useTaskImages composable owning image state per edit dialog, with
  eager-load priming in load() so thumbnails render and are clickable in
  the grid (fixes v-if branch gated on populated imageCache).
- taskService refactored: listTaskImages / createTaskImage / deleteTaskImage
  / getTaskImageContent (blob fetch with responseType: 'blob' to dodge 406s).
- apiEndpoints.TASKS.IMAGES added for documentation purposes only — services
  still hardcode paths (CLAUDE.md flags apiEndpoints as stale).
- TaskView.vue: switched from inline task.images to useTaskImages(); image
  upload / preview / delete / carousel wired to the new composable. Explicit
  taskId passed to load() and commit() since useTaskImages is instantiated
  without a taskIdRef at module scope.
- locales en/zh-CN: new image keys (addImage, pendingUpload, clickToLoad,
  imagePartialFailure, imageLimitReached, etc.).

Tests:
- src/__tests__/api/taskService.test.js
- src/__tests__/composables/useTaskImages.test.js
- src/__tests__/composables/useTaskImages.network.test.js

Also: .claude/ added to .gitignore (Claude Code local permissions, per-dev).
Co-Authored-By: Claude <noreply@anthropic.com>

UI: add Settings skeleton page with v-tabs + 6 categories
UI: enlarge TaskView event fonts and replace progress bar with SVG ring
UI: add native title tooltip on TaskView events
UI: convert filter panel toggle to floating icon button with slide animation
UI: set browser tab title to "学生管理系统"