fix: limit default run selection to most recent N runs on open

[KomalDeep355]

Fixes #573

Problem

When a project has many runs, all of them are selected on open, which makes the Trackio dashboard very slow.

Solution

Added a 'MAX_SELECTED_RUNS = 10' constant and a 'max_runs' parameter to 'get_runs_for_project()'. Only the most recent N runs are selected by default. All runs remain visible — only the default Selection is capped.

Changes

• Added 'MAX_SELECTED_RUNS = 10' constant in 'server.py'
• Updated 'get_runs_for_project()' to accept and apply 'max_runs'

[abidlabs]

Thanks @KomalDeep355 but I think a better fix would be to solve the undelrhying issue of Trackio becoming slow, will look into it

[KomalDeep355]

Thanks for the feedback @abidlabs! That makes sense — fixing the root cause is definitely the better approach. I'd love to help with that if possible. Could you point me to where the slowness originates in the codebase? Happy to take a look and submit a follow-up PR.