VLM node: remove field labels and update default server URL

[Copilot]

The VLM node widgets displayed visible labels (Model, Caption, Server, Insensitivity Delay) next to each input, and the default server pointed to localhost.

Changes

• Remove widget labels — Set label="" on all four VLM node inputs (model combo, caption text, server text, insensitivity slider) to suppress the inline label text in the node UI
• Update default server — DEFAULT_SERVER changed from http://localhost:5000 → http://10.217.172.75:8000

# Before
DEFAULT_SERVER = 'http://localhost:5000'
dpg.add_combo(..., label="Model", ...)
dpg.add_input_text(..., label="Caption", ...)
dpg.add_input_text(..., label="Server", ...)
dpg.add_slider_float(..., label="Insensitivity Delay (s)", ...)

# After
DEFAULT_SERVER = 'http://10.217.172.75:8000'
dpg.add_combo(..., label="", ...)
dpg.add_input_text(..., label="", ...)
dpg.add_input_text(..., label="", ...)
dpg.add_slider_float(..., label="", ...)

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