fix: correct logic bugs in libarchive, s3 credentials, and postgres bindings (#25905)

## Summary

- **libarchive.zig:110**: Fix self-assignment bug where `this.pos` was
assigned to itself instead of `new_pos`
- **s3/credentials.zig:165,176,199**: Fix impossible range checks -
`and` should be `or` for pageSize, partSize, and retry validation (a
value cannot be both less than MIN and greater than MAX simultaneously)
- **postgres.zig:14**: Fix copy-paste error where createConnection
function was internally named "createQuery"

## Test plan

- [ ] Verify S3 credential validation now properly rejects out-of-range
values for pageSize, partSize, and retry
- [ ] Verify libarchive seek operations work correctly
- [ ] Verify postgres createConnection function has correct internal
name

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
Co-authored-by: Claude Bot <claude-bot@bun.sh>

src/sql/postgres.zig

@@ -11,7 +11,7 @@ pub fn createBinding(globalObject: *jsc.JSGlobalObject) JSValue {
     binding.put(
         globalObject,
         ZigString.static("createConnection"),
-        jsc.JSFunction.create(globalObject, "createQuery", PostgresSQLConnection.call, 2, .{}),
+        jsc.JSFunction.create(globalObject, "createConnection", PostgresSQLConnection.call, 2, .{}),
     );
 
     return binding;