Upgrade MCP crate & other fixes

[blind-oracle]

• 0.3.0 imcp2 & a few other crates
• MCP redirect now preserves path & query
• Call MCP's Metrics::refresh() every 5s
• Fix unrelated unused imports in SEV

[zeropath-ai]

✅ No security or compliance issues detected. Reviewed everything up to 2a4ed80.

Security Overview

• 🔎 Scanned files: 4 changed file(s)
• 🔗 Scan Link: https://zeropath.com/app/repositories/2f4ca4b6-3e66-473c-8350-2a581fad9f23?scanId=8a7f5a4c-5db5-40bd-b642-177defb152c6&codeScanTypes=PrScan&tab=issues

Detected Code Changes

Change Type	Relevant files
Enhancement	► Cargo.lock     Update dependency versions and checksums (e.g., aws-lc-rs, aws-lc-sys, imcp2, libredox, tower-http, smallvec, etc.)
Enhancement	► Cargo.toml     imcp2 updated to version 0.3
Enhancement	► src/mcp.rs     Add MetricsWrapper with periodic refresh; adjust mcp_redirect_url handling to trim trailing slash; add MCP metrics refresh task; modify redirect fallback to preserve original request path/query in redirect URL
Enhancement	► src/mcp.rs     Add interval task for "mcp-metrics-refresh"
Enhancement	► src/routing/mod.rs     Inline rate limiter bypasser implementation under sev_snp feature gate; replace explicit RateLimitBypasser type usage with in-place definition and wiring
Enhancement	► src/routing/mod.rs     Modify conditional compilation path to include new rate limiter bypasser logic when sev_snp is enabled
Enhancement	► src/routing/mod.rs     Adjust tests for MCP redirect behavior to verify path and query preservation in redirects; add new test scenarios for trailing slash handling on root-redirect