feat(projects): link CRM companies and git authors to projects

Add List/Add/Remove project contacts and CLI:
contacts list|add|remove|link-git|link-authors.
Contacts tab (CRM) is separate from ProjectTeam portal users.

project_contacts.go

@@ -0,0 +1,35 @@
+package onlyoffice
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+	"strconv"
+)
+
+// ListProjectContacts returns CRM persons/companies linked to a project.
+// GET /api/2.0/crm/contact/project/{projectid}
+func (c *Client) ListProjectContacts(ctx context.Context, projectID int) ([]map[string]any, error) {
+	return c.ResponseArray(ctx, fmt.Sprintf("/api/2.0/crm/contact/project/%d", projectID))
+}
+
+// AddProjectContact links a CRM contact (person or company) to a project.
+// POST /api/2.0/project/{projectid}/contact  form: contactId=
+func (c *Client) AddProjectContact(ctx context.Context, projectID, contactID int) (map[string]any, error) {
+	fields := url.Values{}
+	fields.Set("contactId", strconv.Itoa(contactID))
+	return c.postFormObject(ctx, fmt.Sprintf("/api/2.0/project/%d/contact", projectID), fields)
+}
+
+// RemoveProjectContact unlinks a CRM contact from a project.
+// DELETE /api/2.0/project/{projectid}/contact?contactId=
+func (c *Client) RemoveProjectContact(ctx context.Context, projectID, contactID int) error {
+	_, err := c.deleteReq(ctx, fmt.Sprintf("/api/2.0/project/%d/contact?contactId=%d", projectID, contactID))
+	return err
+}
+
+// GetProjectTeam returns portal users on the project team.
+// GET /api/2.0/project/{projectid}/team
+func (c *Client) GetProjectTeam(ctx context.Context, projectID int) ([]map[string]any, error) {
+	return c.ResponseArray(ctx, fmt.Sprintf("/api/2.0/project/%d/team", projectID))
+}