DimSim: configurable camera FOV per robot

[Viswa4599]

Problem

Camera FOV is hardcoded at 80° in the agent capture camera (engine.js) and vision capture (visionCapture.js). Too wide for Go2 and most real robots. Different robots have different camera specs.

Proposed Solution

• Add cameraFov to embodiment config (default 80, Go2 realistic ~60-70)
• Apply to both dimos capture camera and vision capture camera
• Pass from Python EmbodimentConfig → browser via WS relay
• Support runtime update via set_embodiment() or dedicated set_camera_fov()

Files to Change

• DimSim/src/engine.js — dimos capture camera
• DimSim/src/ai/visionCapture.js — vision capture defaults
• DimSim/src/dimos/dimosBridge.ts — apply FOV from config
• dimos/robot/sim/scene_client.py — expose in Python API

Context: dimos team feedback on PR #1390.

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Synced from DIM-776 by summer