feat: add agent skills and guardrails functionality

- Introduced new tools for managing agent skills and guardrails, including add, remove, and list operations.
- Updated README.md to document new commands and usage patterns for skills and guardrails.
- Enhanced server configuration to support longer read and write timeouts.
- Increased maximum upload size for files to 100 MB and adjusted related configurations.
- Created database migrations for agent skills, guardrails, and their associations with projects.
- Updated relevant code files to integrate new skills and guardrails into the application logic.

internal/types/extensions.go

@@ -209,7 +209,30 @@ type Opportunity struct {
 }
 
 type ContactHistory struct {
-	Contact      ProfessionalContact  `json:"contact"`
-	Interactions []ContactInteraction `json:"interactions"`
-	Opportunities []Opportunity       `json:"opportunities"`
+	Contact       ProfessionalContact  `json:"contact"`
+	Interactions  []ContactInteraction `json:"interactions"`
+	Opportunities []Opportunity        `json:"opportunities"`
+}
+
+// Agent Skills & Guardrails
+
+type AgentSkill struct {
+	ID          uuid.UUID `json:"id"`
+	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"`
+}
+
+type AgentGuardrail struct {
+	ID          uuid.UUID `json:"id"`
+	Name        string    `json:"name"`
+	Description string    `json:"description,omitempty"`
+	Content     string    `json:"content"`
+	Severity    string    `json:"severity"`
+	Tags        []string  `json:"tags"`
+	CreatedAt   time.Time `json:"created_at"`
+	UpdatedAt   time.Time `json:"updated_at"`
 }