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.

migrations/002_create_thoughts.sql

@@ -0,0 +1,17 @@
+create table if not exists thoughts (
+  id uuid default gen_random_uuid() primary key,
+  content text not null,
+  embedding vector(1536),
+  metadata jsonb default '{}'::jsonb,
+  created_at timestamptz default now(),
+  updated_at timestamptz default now()
+);
+
+create index if not exists thoughts_embedding_hnsw_idx
+  on thoughts using hnsw (embedding vector_cosine_ops);
+
+create index if not exists thoughts_metadata_gin_idx
+  on thoughts using gin (metadata);
+
+create index if not exists thoughts_created_at_idx
+  on thoughts (created_at desc);