(chore): Add JSONSchema validation for bundle configuration

Bundle configuration is now validated using JSONSchema. Configuration
errors (typos, missing required fields, wrong types) are caught
immediately with clear error messages instead of failing during installation.

Assisted-by: Cursor

Author: camilamacedo86

go.mod

@@ -23,6 +23,7 @@ require (
 	github.com/operator-framework/operator-registry v1.60.0
 	github.com/prometheus/client_golang v1.23.2
 	github.com/prometheus/common v0.67.2
+	github.com/santhosh-tekuri/jsonschema/v6 v6.0.2
 	github.com/spf13/cobra v1.10.1
 	github.com/spf13/pflag v1.0.10
 	github.com/stretchr/testify v1.11.1
@@ -191,7 +192,6 @@ require (
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/rubenv/sql-migrate v1.8.0 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
-	github.com/santhosh-tekuri/jsonschema/v6 v6.0.2 // indirect
 	github.com/secure-systems-lab/go-securesystemslib v0.9.1 // indirect
 	github.com/shopspring/decimal v1.4.0 // indirect
 	github.com/sigstore/fulcio v1.7.1 // indirect