chore: move ProcessAutoKiller.zig to api/process/

Process-related utilities belong in api/process/.

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

Co-Authored-By: Claude <noreply@anthropic.com>

src/buntime/VirtualMachine.zig

@@ -201,7 +201,7 @@ pub fn getDevServerAsyncLocalStorage(this: *VirtualMachine) !?jsc.JSValue {
     return jsvalue;
 }
 
-pub const ProcessAutoKiller = @import("./ProcessAutoKiller.zig");
+pub const ProcessAutoKiller = @import("./api/process/ProcessAutoKiller.zig");
 pub const OnUnhandledRejection = fn (*VirtualMachine, globalObject: *JSGlobalObject, JSValue) void;
 
 pub const OnException = fn (*ZigException) void;