## Summary
- Replace regex-based private IP detection in `isPrivateIp` with Node.js
`net.BlockList` for CIDR-based range checking, which properly handles
all IPv4-mapped IPv6 representations (both dotted-decimal and hex forms)
- Add missing non-routable IP ranges: carrier-grade NAT
(`100.64.0.0/10`), IANA special purpose, documentation networks,
benchmarking, multicast, and reserved ranges
- Add protocol allowlist (http/https only) as an axios request
interceptor in `SecureHttpClientService` and as a Zod refinement in the
HTTP tool schema
## Test plan
- [x] All 100 existing + new tests pass across 4 secure-http-client test
suites
- [x] New tests cover carrier-grade NAT range boundaries (100.64.0.0 –
100.127.255.255)
- [x] New tests cover documentation, benchmarking, multicast, and
reserved ranges
- [x] New tests cover hex-form IPv4-mapped IPv6 addresses (the form
Node.js URL parser actually produces)
- [x] New tests verify protocol interceptor blocks `ftp:` and `file:`
schemes
- [x] New tests verify protocol interceptor is only active when safe
mode is enabled
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