feat: add label endpoint

[olblak]

Add a new "label" table to store Updatecli report labels
Add a new endpoint /api/pipeline/labels to retrieve labels

Description

Test

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make test

Additional Information

Tradeoff

Potential improvement

[Copilot]

Pull request overview

This PR introduces first-class support for storing and querying Updatecli report labels by adding a new labels table, wiring label IDs into pipelineReports, and exposing a new read/search API under the pipeline routes.

Changes:

• Add labels table + migration, and add label_ids UUID[] to pipelineReports with a trigger to maintain labels.last_pipeline_report_at.
• Add /api/pipeline/labels (GET) and /api/pipeline/labels/search (POST) handlers and route registrations.
• Update report insertion to initialize labels and persist label_ids; add endpoint tests for the new labels endpoint.

Reviewed changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pkg/server/labeldb_handlers.go	Adds list/search HTTP handlers for labels with optional filtering and “key-only” mode.
pkg/server/endpoints.go	Registers the new labels routes under /api/pipeline.
pkg/server/endpoints_test.go	Adds integration tests for GET /api/pipeline/labels and cleanup helper.
pkg/model/label.go	Introduces the Label model used by DB queries and API responses.
pkg/model/pipelinereport.go	Adds LabelIDs field to represent label relationships on reports.
pkg/database/label.go	Adds label CRUD/query helpers + label initialization logic.
pkg/database/report.go	Persists label_ids when inserting reports.
pkg/database/time_utils.go	Generalizes the date-range helper to accept a column name.
pkg/database/migrations/000007_create_labels_tables.*.sql	Creates/drops the labels table and indexes.
pkg/database/migrations/000008_alter_pipelineReports_tables.up.sql	Adds label_ids + trigger to sync last_pipeline_report_at.
pkg/database/migrations/000008_alter_pipelineReports_labels.down.sql	Drops the trigger/function and removes label_ids.
go.mod / go.sum	Bumps Go version and updates dependencies; adds a replace for yaml-jsonpath.
docker-compose.yaml	Removes deprecated compose version field.

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