fix(tool): initialize asset isModified state on startup to prevent 2x hot restart slowdown (#187488) Prior to this fix, the first hot restart would incorrectly detect all assets as modified and sync/recompile all of them. This was because DevFS.updateBundle bypassed the asset loop during the initial application startup, which prevented the stateful isModified getter from being initialized. This fix accesses isModified for each asset in the bundle during startup to initialize the cache, matching the behavior before the asset processing refactor. Fixes https://github.com/flutter/flutter/issues/187391
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