feat(embeddings): add embedding model support and related changes

* Introduced EmbeddingModel method in Client and Provider interfaces
* Updated InsertThought and SearchThoughts methods to handle embedding models
* Created embeddings table and updated match_thoughts function for model filtering
* Removed embedding column from thoughts table
* Adjusted permissions for new embeddings table

internal/mcpserver/schema.go

@@ -0,0 +1,47 @@
+package mcpserver
+
+import (
+	"context"
+	"fmt"
+	"reflect"
+
+	"github.com/google/jsonschema-go/jsonschema"
+	"github.com/google/uuid"
+	"github.com/modelcontextprotocol/go-sdk/mcp"
+)
+
+var toolSchemaOptions = &jsonschema.ForOptions{
+	TypeSchemas: map[reflect.Type]*jsonschema.Schema{
+		reflect.TypeFor[uuid.UUID](): {
+			Type:   "string",
+			Format: "uuid",
+		},
+	},
+}
+
+func addTool[In any, Out any](server *mcp.Server, tool *mcp.Tool, handler func(context.Context, *mcp.CallToolRequest, In) (*mcp.CallToolResult, Out, error)) {
+	if err := setToolSchemas[In, Out](tool); err != nil {
+		panic(fmt.Sprintf("configure MCP tool %q schemas: %v", tool.Name, err))
+	}
+	mcp.AddTool(server, tool, handler)
+}
+
+func setToolSchemas[In any, Out any](tool *mcp.Tool) error {
+	if tool.InputSchema == nil {
+		inputSchema, err := jsonschema.For[In](toolSchemaOptions)
+		if err != nil {
+			return fmt.Errorf("infer input schema: %w", err)
+		}
+		tool.InputSchema = inputSchema
+	}
+
+	if tool.OutputSchema == nil {
+		outputSchema, err := jsonschema.For[Out](toolSchemaOptions)
+		if err != nil {
+			return fmt.Errorf("infer output schema: %w", err)
+		}
+		tool.OutputSchema = outputSchema
+	}
+
+	return nil
+}