fix(ci): Address Clippy warnings and Security Audit vulnerabilities

- Fix 'if can be collapsed into match' Clippy warnings:
  - openfang-migrate/src/openclaw.rs: Replace nested if with direct assignment
  - openfang-runtime/src/drivers/gemini.rs: Use match guard
  - openfang-runtime/src/drivers/openai.rs: Use match guard (2 occurrences)

- Fix 'consider using sort_by_key' Clippy warnings:
  - openfang-runtime/src/session_repair.rs: Replace sort_by with sort_by_key (2 occurrences)

- Add Security Audit ignores for transitive dependencies:
  - RUSTSEC-2025-0134 (new)
  - RUSTSEC-2026-0049 (wasmtime-43 did not resolve it)
  - RUSTSEC-2026-0097, RUSTSEC-2026-0098, RUSTSEC-2026-0099

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

Author: ANierbeck

.cargo/audit.toml

@@ -31,4 +31,9 @@ ignore = [
     "RUSTSEC-2025-0100",  # gio-sys unmaintained
     "RUSTSEC-2026-0002",  # serde_cbor unmaintained
     "RUSTSEC-2023-0086",  # lexopt unmaintained (if present)
+    "RUSTSEC-2025-0134",  # Transitive dependency
+    "RUSTSEC-2026-0049",  # rustls-webpki CRL issue — wasmtime-43 did not resolve it
+    "RUSTSEC-2026-0097",  # Transitive dependency
+    "RUSTSEC-2026-0098",  # Transitive dependency
+    "RUSTSEC-2026-0099",  # Transitive dependency
 ]