Support synchronized 1-step moves and spherical fly-scanning (R, theta, phi) in i06 vector magnet

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### Goals
Acceptance criteria : What journeys should the user be able to complete to consider your feature done
Be as specific as you can, check them off once they work. Add more if you find more requirements during development. Issue should only be considered done after all of them are checked
- [ ] All field moves in any mode should execute in a single synchronized ramp step instead of discrete steps.
- [ ] User can configure and execute Bluesky fly scans along spherical coordinate axis ($R, \theta, \phi$) in addition to Cartesian axes ($X, Y, Z$).
- [ ] Controller calculates and applies proportional per-axis ramp rates prior to initiating movement (scale to fit into the slowest axis if limit hit).
- [ ] R is always with in limit of each mod.
### Tasks
base on the goals, deduce the tasks required. check them off once they're done
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### Related Resources
any images/gifs, mockups/wireframes that would aid the development should be listed here
MockUp : `link to mockup`
Coda doc: `link to coda`
**Additional context**
Add any other context or screenshots about the feature request here.

No files or tests are identified in the issue. Start by locating the controller and Bluesky fly-scan entry points, then trace how Cartesian moves and axis limits are currently handled; the work is done when synchronized one-step moves, proportional ramp rates, bounded R values, and spherical R/θ/φ scans satisfy every listed acceptance criterion.

Written by the indexing model from the issue text.