feat(skills): enhance agent skills with additional tags and commands

- Added language_tags, library_tags, framework_tags, and domain_tags to agent skills.
- Introduced new commands: get_skill and get_guardrail for fetching specific skills and guardrails.
- Updated database schema and migration scripts to accommodate new fields.
- Enhanced skill listing functionality to support filtering by new tags.
- Improved error handling and response structures for skill-related operations.

internal/types/extensions.go

@@ -217,14 +217,18 @@ type ContactHistory struct {
 // Agent Skills & Guardrails
 
 type AgentSkill struct {
-	ID          int64     `json:"id"`
-	GUID        uuid.UUID `json:"guid"`
-	Name        string    `json:"name"`
-	Description string    `json:"description,omitempty"`
-	Content     string    `json:"content"`
-	Tags        []string  `json:"tags"`
-	CreatedAt   time.Time `json:"created_at"`
-	UpdatedAt   time.Time `json:"updated_at"`
+	ID            int64     `json:"id"`
+	GUID          uuid.UUID `json:"guid"`
+	Name          string    `json:"name"`
+	Description   string    `json:"description,omitempty"`
+	Content       string    `json:"content,omitempty"`
+	Tags          []string  `json:"tags"`
+	LanguageTags  []string  `json:"language_tags"`
+	LibraryTags   []string  `json:"library_tags"`
+	FrameworkTags []string  `json:"framework_tags"`
+	DomainTags    []string  `json:"domain_tags"`
+	CreatedAt     time.Time `json:"created_at"`
+	UpdatedAt     time.Time `json:"updated_at"`
 }
 
 type AgentGuardrail struct {