feat: optimize dependency management and repository metadata

Dependency Management Improvements:
✅ Repository metadata updates
  - Updated repository references from rust-postgres to gaussdb-rust
  - Maintained consistent versioning across all packages (0.1.0)
  - Updated CI badge references for gaussdb ecosystem

✅ Dependency verification
  - Confirmed all GaussDB authentication dependencies present:
    * sha2 v0.10 for SHA256 authentication
    * md-5 v0.10 for MD5_SHA256 authentication
    * hmac v0.12 for HMAC operations
    * pbkdf2 v0.12 for password-based key derivation
  - Verified no duplicate or conflicting dependencies

✅ License compliance
  - All packages use MIT OR Apache-2.0 license (compatible)
  - No license conflicts detected
  - Maintained open source compliance standards

Test Results:
- gaussdb: 18/22 tests passing (4 ignored - expected)
- gaussdb-derive-test: 26/26 tests passing (100% success rate)
- gaussdb-protocol: 29/29 tests passing (100% success rate)
- tokio-gaussdb: 5/5 tests passing (100% success rate)

All dependency management optimizations completed successfully.

Author: louloulin