refactor!: rename oo-cli → oo, split library by domain, relocate applications

BREAKING:
- Binary renamed oo-cli → oo; install path is now
  github.com/eslider/go-onlyoffice/cmd/oo.
- Former internal/cli tree removed; cobra commands live in cmd/oo/ as
  package main, split by domain (calendar.go, crm.go, tasks.go, apps.go,
  common.go, main.go).
- internal/applications moved to cmd/oo/applications/ (CV-specific workflow;
  not a library feature).
- examples/applications removed (it depended on an internal package).

Library split (mechanical, zero API surface change):
- client.go  — Client, Credentials, Defaults, env helpers, NewClient.
- request.go — Request, Query, Time, Token, MetaResponse, Permissions.
- auth.go    — Authenticate/AuthenticateContext/InvalidateToken.
- http.go    — transport + ResponseArray/ResponseObject/postFormObject/
               putFormObject/deleteObject/unmarshalResponseObject (renamed
               from httpx.go).
- projects.go, tasks.go, users.go, calendar.go, crm.go, files.go — typed
  / untyped domain methods. tasks_extra.go merged into tasks.go.
- onlyoffice.go deleted (content redistributed).

AGENTS.md, CHANGELOG.md, README.md updated accordingly.

Made-with: Cursor

client.go

@@ -0,0 +1,108 @@
+// Package onlyoffice provides a Go client for the OnlyOffice Workspace
+// (formerly ONLYOFFICE) REST API. It is organised as a flat single package
+// intentionally: a single *Client exposes Projects, Tasks, Calendar, CRM and
+// Files operations as receiver methods. Domain split is by file, not by
+// subpackage, to keep call sites uniform (c.ListContacts, c.GetTasks,
+// c.AddEvent, c.UploadOpportunityFile all live on the same handle).
+//
+// The CLI binary `oo` (see cmd/oo) is a thin cobra wrapper on top of this
+// library and mirrors the Python cv/bin/office reference tooling.
+package onlyoffice
+
+import (
+	"net/http"
+	"os"
+	"strings"
+)
+
+// Client of OnlyOffice API uses credentials to get a token and query the API
+// by every request.
+//
+// Construct with NewClient; optionally set fallbacks via SetDefaults. The
+// zero value is NOT usable — credentials are required. A single client is
+// safe for sequential use from one goroutine; for concurrent use, callers
+// should wrap with their own synchronization or create one client per
+// goroutine.
+type Client struct {
+	client      *http.Client
+	credentials *Credentials
+	token       *Token
+
+	defaults  Defaults // optional fallbacks for calendar/project IDs
+	selfID    string   // cached /api/2.0/people/@self id
+	noteCatID int      // cached CRM history category id for "note"
+}
+
+// NewClient returns a new Client backed by http.DefaultClient.
+func NewClient(c Credentials) *Client {
+	return &Client{
+		client:      http.DefaultClient,
+		credentials: &c,
+	}
+}
+
+// Credentials of OnlyOffice User. The Url field is NOT sent with the auth
+// payload — it only determines the host.
+type Credentials struct {
+	Url      string `json:"-"`
+	User     string `json:"userName"`
+	Password string `json:"password"`
+}
+
+// Defaults holds optional fallbacks used by package-level helpers when callers
+// pass an empty identifier (calendar or project). Set via (*Client).SetDefaults
+// or read from env via GetEnvironmentDefaults.
+type Defaults struct {
+	CalendarID string
+	ProjectID  string
+}
+
+// SetDefaults configures optional identifiers used as fallbacks by methods
+// such as AddEvent (when calendarID == "") or AddTask (when projectID == "").
+func (c *Client) SetDefaults(d Defaults) { c.defaults = d }
+
+// GetEnvironmentCredentials reads OnlyOffice credentials from environment.
+//
+// Primary variables (documented):
+//   - ONLYOFFICE_URL
+//   - ONLYOFFICE_USER
+//   - ONLYOFFICE_PASS
+//
+// Additional aliases accepted for interoperability with sibling tools:
+//   - ONLYOFFICE_HOST        (alias for ONLYOFFICE_URL)
+//   - ONLYOFFICE_NAME        (alias for ONLYOFFICE_USER)
+//   - ONLYOFFICE_PASSWORD    (alias for ONLYOFFICE_PASS)
+func GetEnvironmentCredentials() Credentials {
+	url := firstNonEmpty(os.Getenv("ONLYOFFICE_URL"), os.Getenv("ONLYOFFICE_HOST"))
+	url = strings.TrimRight(url, "/")
+	return Credentials{
+		Url:      url,
+		User:     firstNonEmpty(os.Getenv("ONLYOFFICE_USER"), os.Getenv("ONLYOFFICE_NAME")),
+		Password: firstNonEmpty(os.Getenv("ONLYOFFICE_PASS"), os.Getenv("ONLYOFFICE_PASSWORD")),
+	}
+}
+
+// GetEnvironmentDefaults reads optional library defaults from environment:
+//
+//   - ONLYOFFICE_CALENDAR_ID (default: "1")
+//   - ONLYOFFICE_PROJECT_ID  (alias: ONLYOFFICE_CALENDAR_PROJECT_ID; default: "33")
+func GetEnvironmentDefaults() Defaults {
+	return Defaults{
+		CalendarID: firstNonEmpty(os.Getenv("ONLYOFFICE_CALENDAR_ID"), "1"),
+		ProjectID: firstNonEmpty(
+			os.Getenv("ONLYOFFICE_PROJECT_ID"),
+			os.Getenv("ONLYOFFICE_CALENDAR_PROJECT_ID"),
+			"33",
+		),
+	}
+}
+
+// firstNonEmpty returns the first non-empty trimmed value, or "" if none.
+func firstNonEmpty(vals ...string) string {
+	for _, v := range vals {
+		if s := strings.TrimSpace(v); s != "" {
+			return s
+		}
+	}
+	return ""
+}