fix(gui): address all P1 code review findings
- AgentLayout: lazy-load views via defineAsyncComponent, wire route meta to quadrant tab switching
- QuadrantPanel: ARIA tablist/tab/tabpanel roles, keyboard nav, v-if via computed, expose setActiveTab
- SplitPane: touch support, keyboard resize, ARIA separator role
- ChatMessage: DOMPurify sanitization, anchor toolCalls regex to line start
- TerminalEmulator: fix ANSI span imbalance with depth tracking
- theme.ts: read CSS custom properties at runtime via readToken()
- responsive.css: fix bottom-right auto-collapse selector
- app.py: path traversal protection, exclude docs/openapi.json
- skills.ts: use BaseApiClient.request() for installSkill/uninstallSkill
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