fix(security): resolve IPv4 signed 32-bit integer overflow in SSRF protection (#3118)

[desireddymohithreddy0925]

Summary

Resolves a critical Server-Side Request Forgery (SSRF) bypass by fixing a signed 32-bit integer overflow in the IP parsing logic.

Closes #3118

---

Type of Change

• 🔒 Security fix

---

What Changed

• Updated the ipToNumber utility in src/lib/ssrf-protection.ts to construct IP numbers using safe unsigned multiplication instead of bitwise shifting, preventing values like 192.x.x.x and 172.x.x.x from wrapping into negative numbers and bypassing private IP range checks.

[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus