fix(redirect): follow redirect when creating database (GH#bd-0qel)

When bd runs with --no-daemon or during init in a directory that has a
.beads/redirect file, it now correctly follows the redirect to create
the database in the target location instead of locally.

The bug occurred because:
1. init.go hardcoded .beads/beads.db without checking for redirects
2. main.go's fallback path for auto-bootstrap also used local .beads

Both code paths now call beads.FollowRedirect() to resolve the correct
.beads directory before constructing the database path.

Added TestInitWithRedirect to verify the fix.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cmd/bd/main.go

@@ -532,7 +532,16 @@ var rootCmd = &cobra.Command{
 				// Invariant: dbPath must always be absolute for filepath.Rel() compatibility
 				// in daemon sync-branch code path. Use CanonicalizePath for OS-agnostic
 				// handling (symlinks, case normalization on macOS).
-				dbPath = utils.CanonicalizePath(filepath.Join(".beads", beads.CanonicalDatabaseName))
+				//
+				// IMPORTANT: Use FindBeadsDir() to get the correct .beads directory,
+				// which follows redirect files. Without this, a redirected .beads
+				// would create a local database instead of using the redirect target.
+				// (GH#bd-0qel)
+				targetBeadsDir := beads.FindBeadsDir()
+				if targetBeadsDir == "" {
+					targetBeadsDir = ".beads"
+				}
+				dbPath = utils.CanonicalizePath(filepath.Join(targetBeadsDir, beads.CanonicalDatabaseName))
 			}
 		}