feat: add user skills

[dsh0416]

No description provided.

[Copilot]

Pull request overview

Adds “skills” to user profiles end-to-end (DB → API → frontend), while also tightening who can update a user profile (owner or system admin) and reflecting that capability in the UI.

Changes:

• Persist skills on users (migration + model normalization/validation) and expose it via the users API + OpenAPI schema.
• Add frontend types + UI for editing and viewing skills in the user profile form/details.
• Enforce profile-update authorization in UserPolicy#update? and adjust request/OpenAPI specs accordingly.

Reviewed changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
frontend/src/views/UserProfileView.vue	Adds canEditProfile gating for edit UI and messaging.
frontend/src/views/UserGroupsView.vue	Computes edit capability, updates current-user after profile save, passes can-edit-profile prop.
frontend/src/stores/auth.ts	Adds replaceCurrentUser to sync auth store when editing self.
frontend/src/stores/tests/userGroups.spec.ts	Updates test fixtures to include skills.
frontend/src/services/api/types.ts	Adds UserSkill/UserSkillLevel types and wires skills into User and UserProfileInput.
frontend/src/router/tests/access.spec.ts	Updates route-access test user fixture to include skills.
frontend/src/components/user-groups/UserProfileForm.vue	Adds skills editor UI and submission mapping to UserProfileInput.
frontend/src/components/user-groups/UserProfileDetails.vue	Displays skills list with level badges.
backend/spec/requests/api/v1/users_spec.rb	Adds request specs for skills update/validation + update authorization behavior.
backend/spec/requests/api/v1/openapi/users_spec.rb	Updates OpenAPI request examples to include skills.
backend/spec/openapi_helper.rb	Extends OpenAPI schema with skills and profile_skill.
backend/spec/models/user_spec.rb	Adds model specs for skills normalization/validation.
backend/spec/factories/users.rb	Ensures users factory includes skills: [].
backend/openapi/v1/openapi.yaml	Updates generated OpenAPI YAML with skills and profile_skill.
backend/db/schema.rb	Reflects skills column addition.
backend/db/migrate/20260709110000_add_skills_to_users.rb	Adds skills JSON column to users.
backend/app/views/api/v1/users/_user.json.jbuilder	Includes skills in user JSON payload.
backend/app/policies/user_policy.rb	Restricts profile updates to self or system admin.
backend/app/models/user.rb	Adds skills normalization, validation, and search indexing content/metadata.
backend/app/controllers/api/v1/users_controller.rb	Permits nested skills params for profile update.

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