feat: rename Docker Watcher to Tinyforge

Rebrand the project as Tinyforge to reflect its evolution from a Docker
container watcher into a self-hosted mini CI/deployment platform.

Rename covers: Go module path, Docker labels, DB/config filenames,
JWT issuer, Dockerfile binary, docker-compose, CI workflows, frontend
i18n, README with static sites docs, and all code comments.

internal/store/store.go

@@ -110,7 +110,7 @@ func (s *Store) runMigrations() error {
 		`ALTER TABLE settings ADD COLUMN traefik_network TEXT NOT NULL DEFAULT ''`,
 		`ALTER TABLE settings ADD COLUMN traefik_api_url TEXT NOT NULL DEFAULT ''`,
 		// Set default network for existing databases with empty network.
-		`UPDATE settings SET network = 'docker-watcher' WHERE network = ''`,
+		`UPDATE settings SET network = 'tinyforge' WHERE network = ''`,
 		// NPM remote mode: forward to server_ip instead of container name.
 		`ALTER TABLE settings ADD COLUMN npm_remote INTEGER NOT NULL DEFAULT 0`,
 		// Resource limits per stage.
@@ -219,7 +219,7 @@ CREATE TABLE IF NOT EXISTS settings (
 	domain              TEXT NOT NULL DEFAULT '',
 	server_ip           TEXT NOT NULL DEFAULT '',
 	public_ip           TEXT NOT NULL DEFAULT '',
-	network             TEXT NOT NULL DEFAULT 'docker-watcher',
+	network             TEXT NOT NULL DEFAULT 'tinyforge',
 	subdomain_pattern   TEXT NOT NULL DEFAULT 'stage-{stage}-{project}',
 	notification_url    TEXT NOT NULL DEFAULT '',
 	npm_url             TEXT NOT NULL DEFAULT '',