feat(plugins): add JSONForms-based plugin configuration UI (#4911)

* feat(plugins): add JSONForms schema for plugin configuration

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: enhance error handling by formatting validation errors with field names

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: enforce required fields in config validation and improve error handling

Signed-off-by: Deluan <deluan@navidrome.org>

* format JS code

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: add config schema validation and enhance manifest structure

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: refactor plugin config parsing and add unit tests

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: add config validation error message in Portuguese

* feat: enhance AlwaysExpandedArrayLayout with description support and improve array control testing

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: update Discord Rust plugin configuration to use JSONForm for user tokens and enhance schema validation

Signed-off-by: Deluan <deluan@navidrome.org>

* fix: resolve React Hooks linting issues in plugin UI components

* Apply suggestions from code review

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* format code

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: migrate schema validation to use santhosh-tekuri/jsonschema and improve error formatting

Signed-off-by: Deluan <deluan@navidrome.org>

* address PR comments

Signed-off-by: Deluan <deluan@navidrome.org>

* fix flaky test

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: enhance array layout and configuration handling with AJV defaults

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: implement custom tester to exclude enum arrays from AlwaysExpandedArrayLayout

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: add error boundary for schema rendering and improve error messages

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: refine non-enum array control logic by utilizing JSONForms schema resolution

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: add error styling to ToggleEnabledSwitch for disabled state

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: adjust label positioning and styling in SchemaConfigEditor for improved layout

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: implement outlined input controls renderers to replace custom fragile CSS

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: remove margin from last form control inside array items for better spacing

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: enhance AJV error handling to transform required errors for field-level validation

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: set default value for User Tokens in manifest.json to improve user experience

Signed-off-by: Deluan <deluan@navidrome.org>

* format

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: add margin to outlined input controls for improved spacing

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: remove redundant margin rule for last form control in array items

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: adjust font size of label elements in SchemaConfigEditor for improved readability

Signed-off-by: Deluan <deluan@navidrome.org>

---------

Signed-off-by: Deluan <deluan@navidrome.org>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

plugins/manifest.go

@@ -3,6 +3,8 @@ package plugins
 import (
 	"encoding/json"
 	"fmt"
+
+	"github.com/santhosh-tekuri/jsonschema/v6"
 )
 
 //go:generate go tool go-jsonschema -p plugins --struct-name-from-title -o manifest_gen.go manifest-schema.json
@@ -29,6 +31,26 @@ func (m *Manifest) Validate() error {
 			return fmt.Errorf("'subsonicapi' permission requires 'users' permission to be declared")
 		}
 	}
+
+	// Validate config schema if present
+	if m.Config != nil && m.Config.Schema != nil {
+		if err := validateConfigSchema(m.Config.Schema); err != nil {
+			return fmt.Errorf("invalid config schema: %w", err)
+		}
+	}
+
+	return nil
+}
+
+// validateConfigSchema validates that the schema is a valid JSON Schema that can be compiled.
+func validateConfigSchema(schema map[string]any) error {
+	compiler := jsonschema.NewCompiler()
+	if err := compiler.AddResource("schema.json", schema); err != nil {
+		return fmt.Errorf("invalid schema structure: %w", err)
+	}
+	if _, err := compiler.Compile("schema.json"); err != nil {
+		return err
+	}
 	return nil
 }