chore(labels): park the label designer and printing on feature/labels

The feature needs more rounds than the next release can wait for, so main goes
back to before it: the packages, bindings, migration, UI and i18n all move to
the feature/labels branch, which holds every commit. The 0.26.23 block keeps
only the Station column.

The 0031 migration may already have run on a machine that launched a dev build;
the two label tables it created are inert and the recorded migration row is
harmless — the runner only applies filenames it has, so re-adding the migration
when the branch merges will skip cleanly there and apply everywhere else.

internal/db/migrations/0031_label_templates.sql

@@ -1,30 +0,0 @@
--- Label designer: printable labels for paper QSL work.
---
--- Two tables because the two things have different lifetimes. A STOCK is the
--- physical roll in the printer (width, height, margins) — one per label size,
--- shared by every design printed on it. A TEMPLATE is one design (what goes on
--- the label) and points at the stock it was drawn for. Deleting a design must
--- never take the roll definition of the other designs with it.
---
--- kind separates the two families the operator designs: 'qso' (the label glued
--- on the QSL card, with its repeating QSO table) and 'address' (destination or
--- return address). is_default is per (kind, profile scope) — printing wants
--- "the QSO label" and "the address label" without asking every time.
-CREATE TABLE label_stocks (
-    id          INTEGER PRIMARY KEY,
-    name        TEXT NOT NULL,
-    json        TEXT NOT NULL,
-    created_at  TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now')),
-    updated_at  TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now'))
-);
-CREATE TABLE label_templates (
-    id          INTEGER PRIMARY KEY,
-    name        TEXT NOT NULL,
-    kind        TEXT NOT NULL,
-    profile_id  INTEGER REFERENCES station_profiles(id) ON DELETE SET NULL,
-    stock_id    INTEGER REFERENCES label_stocks(id) ON DELETE SET NULL,
-    json        TEXT NOT NULL,
-    is_default  INTEGER NOT NULL DEFAULT 0,
-    created_at  TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now')),
-    updated_at  TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now'))
-);

internal/db/roles.go

@@ -51,8 +51,6 @@ var settingsTables = []string{
 	"operating_stations_new",
 	"award_references",
 	"qsl_templates",
-	"label_stocks",
-	"label_templates",
 	"cluster_servers",
 	"integrations_udp",
 	"callsign_cache",