feat(db): add project personas and skills tables

* Introduce project_personas table with foreign keys to projects and agent_personas
* Add project_skills table with foreign key to projects and agent_skills
* Include override boolean field in agent_persona_skills and project_skills
* Update schema and migration files to reflect new tables and fields
* Enhance CORS handling to reflect request origin

internal/types/extensions.go

@@ -229,6 +229,7 @@ type AgentSkill struct {
 	DomainTags    []string  `json:"domain_tags"`
 	CreatedAt     time.Time `json:"created_at"`
 	UpdatedAt     time.Time `json:"updated_at"`
+	Override      bool      `json:"override,omitempty"`
 }
 
 type AgentGuardrail struct {