MCP call logs: clickable rows with full request dump + fix pagination

[Copilot]

MCP call log rows were not clickable and didn't store request payloads. Pagination UI existed but the handler always served page 1.

Changes

DB / Migration

• New migration 014_mcp_log_request_body.sql: adds request_body TEXT to mcp_logs
• McpLog struct gains request_body: Option<String>; list_mcp_logs SELECTs it; log_mcp_call accepts and INSERTs it

Backend (mcp.rs)

• McpRequest derives Serialize so the incoming request can be round-tripped to JSON at handler entry
• handle: captures serde_json::to_string(&req) before dispatch and passes it to all three log_mcp_call call sites (ok, error, unknown-method)
• McpPageQuery { page: i64 } extractor added; page handler now reads ?page=N, computes offset, and clamps to valid range

Template (mcp/page.html)

• Each <tr> gets data-body="..." (Askama HTML-escapes), cursor:pointer, and onclick="showMcpLog(this)"
• Native <dialog> modal displays the full request body as pretty-printed JSON via JSON.parse/JSON.stringify
• Logs with no stored body (pre-migration rows) show (no request body recorded)

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