Agent: auto-save flows, query history, shareable URLs, and conversation continuation

[Copilot]

Agent queries are ephemeral today — no history, no way to resume or share a result. This adds persistent flows that are saved automatically after every query, with history, shareable URLs, and full context continuation for follow-up queries.

Storage (agent/flows.go)

• New Flow struct: ID, AccountID, Prompt, Steps (tool+args+result per call), Answer, CreatedAt
• Persisted to agent_flows.json via existing data.SaveJSON/LoadJSON pattern
• listFlows returns per-user flows sorted newest-first; deleteFlow enforces ownership

Query handler (agent/agent.go)

• Auto-save: every successful query is saved as a Flow immediately after synthesis — no user action needed
• Continue: POST body accepts context_id; prior flow's question+answer is injected into the synthesizer RAG so follow-ups have full context. SSE response event now includes flow_id so the client automatically chains subsequent queries:

  // client side — after first response
  if (ev.flow_id) { document.getElementById('agent-context').value = ev.flow_id; }

• History: authenticated users see a "Recent queries" card on /agent (last 20, newest-first) with age, tools used, and View/Continue links
• Shareable URLs: GET /agent/flow/<id> renders the full response (answer card + typed cards + references) publicly; anyone with the link can view
• Delete: DELETE /agent/flow/<id> with ownership check; returns 500 on persistence failure rather than silently succeeding

Routing (main.go)

• Added http.HandleFunc("/agent/", agent.Handler) to capture /agent/flow/* sub-paths

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