Add debug context viewer and document/framework popups

[neyec]

Summary

• Debug context viewer: red "Debug" button (visible when NORMA_DEBUG=true) on each page header, showing only the context that page contributes to Norma's system prompt. Full system prompt shown on the chat page.
• Document popups: clicking an uploaded document opens a full-screen modal with its markdown summary. Added delete button for uploaded framework documents and custom documents.
• Framework popups: clicking a framework card opens a full-screen viewer with the full framework content rendered as markdown, with word count and page estimate.
• Unified overview section: description and risk classification pages share a combined debug output with "EU AI Act Risk Classification" subsection.
• Evidence grouping: reporting debug output groups evidence by framework (EU AI Act, UNDP, Environmental) with answer counts and human-readable labels.
• UNDP framework content: loaded the full UNDP Human Rights Assessment toolkit summary as framework knowledge.
• Bug fixes: document upload 422 (route ordering), nginx upload size limit, api.delete 204 handling, markdown separator stripping.
• i18n: all new UI text translated to en/es/fr/de.

Test plan

• Enable NORMA_DEBUG=true and verify the debug button appears on all pages
• Click Debug on each page and verify only the relevant context section is shown
• Upload a PDF to additional documents and verify it appears in the list
• Click an uploaded document and verify the summary popup renders markdown
• Delete an uploaded document (both framework and custom) and verify it's removed
• Click each framework card and verify the content viewer opens with markdown
• Verify UNDP framework shows full content instead of "no content available"
• Check the reporting debug output groups evidence by framework with counts
• Verify no horizontal scrolling in document tables

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