Initial MVP implementation of Claudia Docs CLI

- Auth commands: login, logout, status
- Document commands: create, list, get, update, delete
- Project commands: list, get
- Folder commands: list, create
- Tag commands: list, create, add
- Search command
- Reasoning save command
- JSON output format with --output text option
- Viper-based configuration management
- Cobra CLI framework

internal/api/client.go

@@ -0,0 +1,110 @@
+package api
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+
+	"github.com/claudia/docs-cli/internal/config"
+	"github.com/claudia/docs-cli/pkg/types"
+)
+
+// Client is the API client
+type Client struct {
+	BaseURL    string
+	Token      string
+	HTTPClient *http.Client
+	Timeout    time.Duration
+}
+
+// NewClient creates a new API client
+func NewClient() (*Client, error) {
+	cfg := config.GetConfig()
+	if cfg == nil {
+		cfg = &config.Config{Server: "http://localhost:8000", Timeout: "30s"}
+	}
+
+	timeout, err := time.ParseDuration(cfg.Timeout)
+	if err != nil {
+		timeout = 30 * time.Second
+	}
+
+	return &Client{
+		BaseURL: cfg.Server + "/api/v1",
+		Token:   cfg.Token,
+		HTTPClient: &http.Client{
+			Timeout: timeout,
+		},
+		Timeout: timeout,
+	}, nil
+}
+
+// SetToken sets the authentication token
+func (c *Client) SetToken(token string) {
+	c.Token = token
+}
+
+// doRequest performs an HTTP request
+func (c *Client) doRequest(method, path string, body interface{}) (*http.Response, error) {
+	var reqBody io.Reader
+	if body != nil {
+		jsonData, err := json.Marshal(body)
+		if err != nil {
+			return nil, fmt.Errorf("failed to marshal request body: %w", err)
+		}
+		reqBody = bytes.NewBuffer(jsonData)
+	}
+
+	url := c.BaseURL + path
+	req, err := http.NewRequest(method, url, reqBody)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	if c.Token != "" {
+		req.Header.Set("Authorization", "Bearer "+c.Token)
+	}
+
+	return c.HTTPClient.Do(req)
+}
+
+// DoRequest performs an HTTP request (exported for auth package)
+func (c *Client) DoRequest(method, path string, body interface{}) (*http.Response, error) {
+	return c.doRequest(method, path, body)
+}
+
+// Response parses the API response
+type Response struct {
+	Success bool
+	Data    interface{}
+	Error   *types.ErrorInfo
+}
+
+func parseResponse(resp *http.Response) (*types.Response, error) {
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response body: %w", err)
+	}
+
+	var apiResp types.Response
+	if err := json.Unmarshal(body, &apiResp); err != nil {
+		return nil, fmt.Errorf("failed to parse response JSON: %w", err)
+	}
+
+	return &apiResp, nil
+}
+
+func handleError(resp *http.Response, body []byte) error {
+	var apiResp types.Response
+	if err := json.Unmarshal(body, &apiResp); err != nil {
+		return fmt.Errorf("HTTP %d: %s", resp.StatusCode, string(body))
+	}
+	if apiResp.Error != nil {
+		return fmt.Errorf("%s: %s", apiResp.Error.Code, apiResp.Error.Message)
+	}
+	return fmt.Errorf("HTTP %d: %s", resp.StatusCode, string(body))
+}