feat(tools): implement CRUD operations for thoughts and projects

* Add tools for creating, retrieving, updating, and deleting thoughts.
* Implement project management tools for creating and listing projects.
* Introduce linking functionality between thoughts.
* Add search and recall capabilities for thoughts based on semantic queries.
* Implement statistics and summarization tools for thought analysis.
* Create database migrations for thoughts, projects, and links.
* Add helper functions for UUID parsing and project resolution.

internal/types/project.go

@@ -0,0 +1,40 @@
+package types
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+)
+
+type ThoughtPatch struct {
+	Content  *string         `json:"content,omitempty"`
+	Metadata ThoughtMetadata `json:"metadata,omitempty"`
+	Project  *uuid.UUID      `json:"project_id,omitempty"`
+}
+
+type Project struct {
+	ID           uuid.UUID `json:"id"`
+	Name         string    `json:"name"`
+	Description  string    `json:"description,omitempty"`
+	CreatedAt    time.Time `json:"created_at"`
+	LastActiveAt time.Time `json:"last_active_at"`
+}
+
+type ProjectSummary struct {
+	Project
+	ThoughtCount int `json:"thought_count"`
+}
+
+type ThoughtLink struct {
+	FromID    uuid.UUID `json:"from_id"`
+	ToID      uuid.UUID `json:"to_id"`
+	Relation  string    `json:"relation"`
+	CreatedAt time.Time `json:"created_at"`
+}
+
+type LinkedThought struct {
+	Thought   Thought   `json:"thought"`
+	Relation  string    `json:"relation"`
+	Direction string    `json:"direction"`
+	CreatedAt time.Time `json:"created_at"`
+}