optuna_studies: split 5-PDE dbs into fixed/continuous; drop old burgers_1d.db

update optuna_studies/heat2d_longtime_new.db

update optuna_studies/heat2d_longtime_fixed.db

update optuna_studies/heat2d_longtime_continuous.db

update optuna_studies/grayscott_fixed.db

update optuna_studies/heatnd_fixed.db

update optuna_studies/heat2d_complexgeometry_fixed.db

update optuna_studies/burgers_2d_fixed.db

update optuna_studies/wave2d_longtime_fixed.db

update optuna_studies/heat2d_varyingcoef_fixed.db

update optuna_studies/heat2d_multiscale_fixed.db

update optuna_studies/ns2d_classic_fixed.db

update optuna_studies/wave1d_fixed.db

update optuna_studies/ns2d_backstep_fixed.db

update optuna_studies/poisson2d_classic_fixed.db

update optuna_studies/grayscott.db

update optuna_studies/heatnd.db

update optuna_studies/heat2d_varyingcoef.db

update optuna_studies/wave2d_heterogeneous.db

update optuna_studies/heat2d_complexgeometry.db

update optuna_studies/wave2d_longtime.db

update optuna_studies/poissonnd.db

update optuna_studies/wave2d_heterogeneous_fixed.db

update optuna_studies/poissonnd_fixed.db

update optuna_studies/heat2d_multiscale.db

update optuna_studies/ns2d_backstep.db

update optuna_studies/ns2d_classic.db

update optuna_studies/poissonboltzmann2d_fixed.db

update optuna_studies/poissoninv_fixed.db

update optuna_studies/poisson2d_manyarea.db

update optuna_studies/poissonboltzmann2d.db

update optuna_studies/poissoninv.db

update optuna_studies/poisson2d_manyarea_fixed.db

update optuna_studies/heat2d_longtime.db

update optuna_studies/poisson2d_classic.db

update optuna_studies/burgers_2d.db

update optuna_studies/wave1d.db

update optuna_studies/burgers_1d.db

initial commit