chore: move business tooling out of the public library; tidy filestore naming

Keep the public tree project-generic. Business/one-off tools, deployment
and business docs move to the private oo-workspace repo.

Moved to oo-workspace:
- cmd/ooscan, cmd/pdfamount, cmd/kontoblatt, cmd/kontolink
- internal/xlspipe (cutover-portugal workbook) -> oow workbook build
  (drops the --template/--title flags from oo docs put-xlsx)
- deploy/docker-compose.rclone-webdav.yml + docs/rclone-webdav.md
- docs/crm-associations.md

Removed GitHub-era leftovers:
- .github/workflows/release-please.yml, release-please-config.json,
  .release-please-manifest.json (tags are created on Gitea per SemVer)

Naming: the FileStore subsystem is now filestore_*.go (was file_*.go) to
match files_*.go (project Documents). Docs/AGENTS/README updated.

filestore_core_test.go

@@ -0,0 +1,193 @@
+package onlyoffice
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestFileEntryToEntry(t *testing.T) {
+	id := json.Number("42")
+	title := "invoice.pdf"
+	exst := ".pdf"
+	size := "12345"
+	parent := json.Number("7")
+	updated := time.Date(2026, 1, 2, 3, 4, 5, 0, time.UTC)
+	f := &FileEntry{
+		ID:            &id,
+		Title:         &title,
+		FileExst:      &exst,
+		ContentLength: &size,
+		FolderID:      &parent,
+		Updated:       &updated,
+	}
+
+	e := FileEntryToEntry(f, ProviderREST)
+	if e.ID != "42" {
+		t.Errorf("ID = %q, want 42", e.ID)
+	}
+	if e.ParentID != "7" {
+		t.Errorf("ParentID = %q, want 7", e.ParentID)
+	}
+	if e.Title != title {
+		t.Errorf("Title = %q, want %q", e.Title, title)
+	}
+	if e.Kind != File {
+		t.Errorf("Kind = %v, want file", e.Kind)
+	}
+	if e.Size != 12345 {
+		t.Errorf("Size = %d, want 12345", e.Size)
+	}
+	if e.MIME != "application/pdf" {
+		t.Errorf("MIME = %q, want application/pdf", e.MIME)
+	}
+	if !e.Modified.Equal(updated) {
+		t.Errorf("Modified = %v, want %v", e.Modified, updated)
+	}
+	if e.Provider != ProviderREST {
+		t.Errorf("Provider = %q, want %q", e.Provider, ProviderREST)
+	}
+}
+
+func TestFileEntryToEntryNil(t *testing.T) {
+	e := FileEntryToEntry(nil, ProviderDAV)
+	if e.Kind != File {
+		t.Errorf("Kind = %v, want file", e.Kind)
+	}
+	if e.ID != "" || e.Title != "" {
+		t.Errorf("nil entry should be empty: %+v", e)
+	}
+	if e.Provider != ProviderDAV {
+		t.Errorf("Provider = %q, want %q", e.Provider, ProviderDAV)
+	}
+}
+
+func TestFileEntryToEntrySizeFormats(t *testing.T) {
+	cases := map[string]int64{
+		"12345":   12345,
+		"12345 b": 12345,
+		"0":       0,
+		"":        0,
+		"notanum": 0,
+	}
+	for in, want := range cases {
+		got := parseContentLength(in)
+		if got != want {
+			t.Errorf("parseContentLength(%q) = %d, want %d", in, got, want)
+		}
+	}
+}
+
+func TestDavFileToEntry(t *testing.T) {
+	f := DavFile{
+		ID:      "9",
+		Title:   "note.txt",
+		Size:    10,
+		Updated: "2026-01-02T03:04:05.0000000+01:00",
+	}
+	e := DavFileToEntry(f, ProviderDAV)
+	if e.ID != "9" || e.Title != "note.txt" {
+		t.Errorf("identity mismatch: %+v", e)
+	}
+	if e.Kind != File {
+		t.Errorf("Kind = %v, want file", e.Kind)
+	}
+	if e.Size != 10 {
+		t.Errorf("Size = %d, want 10", e.Size)
+	}
+	if !strings.HasPrefix(e.MIME, "text/plain") {
+		t.Errorf("MIME = %q, want text/plain*", e.MIME)
+	}
+	if e.Modified.IsZero() {
+		t.Error("Modified not parsed")
+	}
+	if e.Provider != ProviderDAV {
+		t.Errorf("Provider = %q, want %q", e.Provider, ProviderDAV)
+	}
+}
+
+func TestDavFolderToEntry(t *testing.T) {
+	f := DavFolder{
+		ID:       "5",
+		Title:    "inbox",
+		ParentID: "1",
+		Updated:  "2026-01-02T03:04:05.0000000+01:00",
+	}
+	e := DavFolderToEntry(f, ProviderDAV)
+	if e.ID != "5" || e.Title != "inbox" || e.ParentID != "1" {
+		t.Errorf("identity mismatch: %+v", e)
+	}
+	if e.Kind != Folder {
+		t.Errorf("Kind = %v, want folder", e.Kind)
+	}
+	if e.MIME != "" {
+		t.Errorf("folder MIME = %q, want empty", e.MIME)
+	}
+	if e.Modified.IsZero() {
+		t.Error("Modified not parsed")
+	}
+}
+
+func TestEntriesFromFolderMap(t *testing.T) {
+	m := map[string]any{
+		"files": []any{
+			map[string]any{"id": float64(42), "title": "a.pdf", "pureContentLength": float64(7)},
+		},
+		"folders": []any{
+			map[string]any{"id": float64(7), "title": "sub", "parentId": float64(1)},
+		},
+	}
+	entries, err := entriesFromFolderMap(m, ProviderREST)
+	if err != nil {
+		t.Fatalf("entriesFromFolderMap: %v", err)
+	}
+	if len(entries) != 2 {
+		t.Fatalf("got %d entries, want 2: %+v", len(entries), entries)
+	}
+	byID := map[string]Entry{}
+	for _, e := range entries {
+		byID[e.ID] = e
+	}
+	if got := byID["42"]; got.Kind != File || got.Size != 7 || got.Title != "a.pdf" {
+		t.Errorf("file entry = %+v", got)
+	}
+	if got := byID["7"]; got.Kind != Folder || got.ParentID != "1" || got.Title != "sub" {
+		t.Errorf("folder entry = %+v", got)
+	}
+}
+
+func TestEntriesFromFolderMapNil(t *testing.T) {
+	entries, err := entriesFromFolderMap(nil, ProviderREST)
+	if err != nil || entries != nil {
+		t.Fatalf("got %v, %v; want nil, nil", entries, err)
+	}
+}
+
+func TestKindString(t *testing.T) {
+	if File.String() != "file" || Folder.String() != "folder" {
+		t.Errorf("kind strings: %q %q", File.String(), Folder.String())
+	}
+	if Kind(9).String() != "unknown" {
+		t.Errorf("unknown kind = %q", Kind(9).String())
+	}
+}
+
+func TestClientFileStoreSelection(t *testing.T) {
+	c := NewClient(Credentials{})
+	if got := c.FileStore(ProviderDAV).Name(); got != ProviderDAV {
+		t.Errorf("FileStore(dav).Name() = %q", got)
+	}
+	if got := c.FileStore("webdav").Name(); got != ProviderDAV {
+		t.Errorf("FileStore(webdav).Name() = %q", got)
+	}
+	if got := c.FileStore(ProviderREST).Name(); got != ProviderREST {
+		t.Errorf("FileStore(rest).Name() = %q", got)
+	}
+	if got := c.FileStore("").Name(); got != ProviderREST {
+		t.Errorf("FileStore(\"\").Name() = %q", got)
+	}
+	if got := c.Files().Name(); got != ProviderREST {
+		t.Errorf("Files().Name() = %q", got)
+	}
+}