Reorganize optional dependencies by communication protocol

[rickwierenga]

Summary

• Replace opaque dependency group names (fw, plate_reading, inheco, agrow) with protocol-based names (serial, usb, ftdi, hid, modbus) so users only install what they need
• Update error messages in pylabrobot/io/*.py and agrowdosepump_backend.py to reference the new group names
• Rewrite the installation docs extras list as a table mapping each group to its packages and use case
• Add installation prerequisites to machine-specific doc pages (Hamilton STAR, pumps, heater-shakers, sealers, tilting, Synergy H1)

Breaking changes

• pip install pylabrobot[fw] → use pylabrobot[usb] (USB only) or pylabrobot[serial] (serial only)
• pip install pylabrobot[plate_reading] → use pylabrobot[ftdi]
• pip install pylabrobot[inheco] → use pylabrobot[hid]
• pip install pylabrobot[agrow] → use pylabrobot[modbus]

Test plan

• Verify pip install pylabrobot[serial] installs only pyserial
• Verify pip install pylabrobot[usb] installs pyusb + libusb-package
• Verify pip install pylabrobot[ftdi] installs pylibftdi + pyusb
• Verify pip install pylabrobot[dev] installs everything
• Verify docs build without errors

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