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

examples/applications/main.go

@@ -1,54 +0,0 @@
-// Package main shows how to drive the internal applications package — the same
-// logic that powers `oo-cli applications-sync` — directly from Go code.
-//
-//	export ONLYOFFICE_URL="https://your-instance.onlyoffice.com"
-//	export ONLYOFFICE_USER="admin@example.com"
-//	export ONLYOFFICE_PASS="your-password"
-//	go run ./examples/applications /path/to/cv/applications
-//
-// Without --apply equivalent, it prints a summary but performs no writes.
-package main
-
-import (
-	"context"
-	"fmt"
-	"log"
-	"os"
-
-	onlyoffice "github.com/eslider/go-onlyoffice"
-	"github.com/eslider/go-onlyoffice/internal/applications"
-)
-
-func main() {
-	if len(os.Args) < 2 {
-		fmt.Fprintln(os.Stderr, "usage: applications <applications-root>")
-		os.Exit(2)
-	}
-	root := os.Args[1]
-
-	creds := onlyoffice.GetEnvironmentCredentials()
-	if creds.Url == "" {
-		fmt.Fprintln(os.Stderr, "ONLYOFFICE_URL is not set")
-		os.Exit(1)
-	}
-	client := onlyoffice.NewClient(creds)
-
-	paths, err := applications.Discover(root)
-	if err != nil {
-		log.Fatalf("discover: %v", err)
-	}
-	fmt.Printf("discovered %d application READMEs under %s\n", len(paths), root)
-
-	var apps []applications.Data
-	for _, p := range paths {
-		d, err := applications.ParseReadme(p)
-		if err != nil {
-			log.Printf("parse %s: %v", p, err)
-			continue
-		}
-		apps = append(apps, d)
-	}
-
-	stats := applications.Sync(context.Background(), client, apps, true /*dryRun*/, true /*verbose*/)
-	fmt.Printf("\ndry-run stats: %+v\n", stats)
-}