Pagination and search in Datatables with serverside

[javuto]

Implementing serverside pagination for nodes table and search. It gets enabled using the flag --optimize-ui / -O or the env variable OPTIMIZE_UI in osctrl-admin. By default it is turned off and when enabled the search requires to press enter.
Implements #635

[Copilot]

Pull Request Overview

This pull request implements server-side pagination and search functionality for the nodes table in the admin UI to optimize performance for deployments with large numbers of nodes. The feature is controlled by a new --optimize-ui flag or OPTIMIZE_UI environment variable.

Key changes:

• Added server-side pagination support with new database methods for counting and searching nodes
• Introduced OptimizeUI configuration flag with corresponding CLI and environment variable support
• Modified the DataTables frontend to use server-side processing when optimization is enabled

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pkg/nodes/nodes.go	Added methods for paginated node retrieval, search, and counting
pkg/config/types.go	Added OptimizeUI field to admin configuration structure
pkg/config/flags.go	Added CLI flag and environment variable support for UI optimization
docker-compose-dev.yml	Enabled UI optimization in development environment
cmd/admin/templates/table.html	Added conditional server-side DataTables configuration
cmd/admin/main.go	Integrated optimization flag into handler configuration and routing
cmd/admin/handlers/types-templates.go	Added OptimizeUI field to template data structure
cmd/admin/handlers/templates.go	Passed optimization flag to template data
cmd/admin/handlers/json-nodes.go	Implemented paginated JSON endpoint with search functionality
cmd/admin/handlers/handlers.go	Added handler option for UI optimization configuration

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