refactor: consolidate paused_groups migration into standard include_str! pattern

[deepjoy]

Summary

• Rename migrations/010_paused_groups.sql to 005_paused_groups.sql to follow the sequential numbering of existing migrations (001–004)
• Replace inline SQL in TaskStore::migrate() with include_str!(), matching the pattern used by all other migrations
• Remove the now-unnecessary ALTER TABLE and backfill UPDATE statements since the DB is always created fresh with the pause_reasons column already present in 001_tasks.sql

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Benchmark Comparison

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group                                       main                                    pr
-----                                       ----                                    --
backoff_delay/constant                      1.06     50.5±1.97ns 377.5 MElem/sec    1.00     47.6±0.14ns 400.6 MElem/sec
backoff_delay/exponential                   1.01    190.4±2.53ns 100.2 MElem/sec    1.00    188.1±1.07ns 101.4 MElem/sec
backoff_delay/exponential_jitter            1.00    269.8±9.22ns 70.7 MElem/sec     1.01    271.6±9.15ns 70.2 MElem/sec
backoff_delay/linear                        1.00     76.4±0.37ns 249.7 MElem/sec    1.06     80.9±0.47ns 235.6 MElem/sec
batch_submit/1000                           1.05     35.8±3.45ms 27.3 KElem/sec     1.00     34.1±2.86ms 28.7 KElem/sec
byte_progress/byte_reporting_500            1.03    200.5±5.64ms  2.4 KElem/sec     1.00    194.4±3.83ms  2.5 KElem/sec
byte_progress/noop_500                      1.07    195.9±5.26ms  2.5 KElem/sec     1.00    183.8±4.85ms  2.7 KElem/sec
byte_progress_snapshot/100_tasks            1.04     86.6±3.75ms  1154 Elem/sec     1.00     83.5±2.20ms  1197 Elem/sec
concurrency_scaling/1                       1.09    421.5±7.36ms  1186 Elem/sec     1.00    385.2±9.03ms  1297 Elem/sec
concurrency_scaling/2                       1.02    291.7±8.28ms  1713 Elem/sec     1.00    287.2±5.84ms  1741 Elem/sec
concurrency_scaling/4                       1.03    241.8±7.30ms  2.0 KElem/sec     1.00    235.3±9.06ms  2.1 KElem/sec
concurrency_scaling/8                       1.07    195.8±5.14ms  2.5 KElem/sec     1.00    182.3±4.34ms  2.7 KElem/sec
count_by_tags/100                           1.02    133.5±5.00µs  7.3 KElem/sec     1.00    130.6±3.34µs  7.5 KElem/sec
count_by_tags/1000                          1.03    226.0±5.06µs  4.3 KElem/sec     1.00    219.3±4.28µs  4.5 KElem/sec
count_by_tags/5000                          1.03   629.0±17.99µs  1589 Elem/sec     1.00   611.8±11.03µs  1634 Elem/sec
dep_chain_dispatch/10                       1.10     12.3±0.13ms   811 Elem/sec     1.00     11.2±0.33ms   892 Elem/sec
dep_chain_dispatch/25                       1.12     30.7±0.45ms   813 Elem/sec     1.00     27.3±0.25ms   914 Elem/sec
dep_chain_dispatch/50                       1.13     61.5±1.00ms   812 Elem/sec     1.00     54.6±0.89ms   916 Elem/sec
dep_chain_submit/10                         1.01      3.1±0.15ms  3.1 KElem/sec     1.00      3.1±0.12ms  3.2 KElem/sec
dep_chain_submit/200                        1.08     86.6±4.82ms  2.3 KElem/sec     1.00     79.8±4.94ms  2.4 KElem/sec
dep_chain_submit/50                         1.03     17.8±1.04ms  2.8 KElem/sec     1.00     17.3±1.05ms  2.8 KElem/sec
dep_fan_in_dispatch/10                      1.08      6.6±0.08ms  1675 Elem/sec     1.00      6.1±0.07ms  1802 Elem/sec
dep_fan_in_dispatch/100                     1.07     45.1±1.12ms  2.2 KElem/sec     1.00     42.1±1.11ms  2.3 KElem/sec
dep_fan_in_dispatch/50                      1.09     23.8±0.55ms  2.1 KElem/sec     1.00     21.8±0.45ms  2.3 KElem/sec
dispatch_and_complete/1000                  1.07    393.1±9.93ms  2.5 KElem/sec     1.00    367.7±8.36ms  2.7 KElem/sec
dispatch_group_scaling/1                    1.04    447.4±8.53ms  1117 Elem/sec     1.00    431.8±7.63ms  1158 Elem/sec
dispatch_group_scaling/10                   1.04    449.3±9.72ms  1112 Elem/sec     1.00    433.9±6.65ms  1152 Elem/sec
dispatch_group_scaling/100                  1.10    478.9±7.03ms  1044 Elem/sec     1.00    434.5±9.38ms  1150 Elem/sec
dispatch_group_scaling/50                   1.04    450.0±9.47ms  1111 Elem/sec     1.00    434.3±7.44ms  1151 Elem/sec
dispatch_no_groups/500                      1.09    203.9±5.96ms  2.4 KElem/sec     1.00    187.7±4.33ms  2.6 KElem/sec
dispatch_one_group/500                      1.03    447.3±9.76ms  1117 Elem/sec     1.00    432.7±7.30ms  1155 Elem/sec
dispatch_permanent_failure/500              1.06    380.2±5.98ms  1314 Elem/sec     1.00    357.3±5.58ms  1399 Elem/sec
history_by_type/100                         1.04    227.1±7.28µs  4.3 KElem/sec     1.00    219.2±6.07µs  4.5 KElem/sec
history_by_type/1000                        1.04   851.2±44.66µs  1174 Elem/sec     1.00   816.4±59.72µs  1224 Elem/sec
history_by_type/5000                        1.05   827.3±49.59µs  1208 Elem/sec     1.00   789.5±30.66µs  1266 Elem/sec
history_query/100                           1.02   440.3±18.28µs  2.2 KElem/sec     1.00   430.6±14.04µs  2.3 KElem/sec
history_query/1000                          1.00   432.6±15.86µs  2.3 KElem/sec     1.01   435.9±15.88µs  2.2 KElem/sec
history_query/5000                          1.02   425.7±18.33µs  2.3 KElem/sec     1.00   419.4±17.81µs  2.3 KElem/sec
history_stats/100                           1.03    132.0±1.28µs  7.4 KElem/sec     1.00    128.1±1.19µs  7.6 KElem/sec
history_stats/1000                          1.02    197.9±2.50µs  4.9 KElem/sec     1.00    193.8±1.07µs  5.0 KElem/sec
history_stats/5000                          1.02    488.3±4.51µs  2047 Elem/sec     1.00    477.3±7.37µs  2.0 KElem/sec
mixed_priority_dispatch/500                 1.04    245.1±7.51ms  2039 Elem/sec     1.00   235.0±11.33ms  2.1 KElem/sec
peek_next/100                               1.07    133.6±5.45µs  7.3 KElem/sec     1.00   125.0±10.87µs  7.8 KElem/sec
peek_next/1000                              1.10    135.0±5.69µs  7.2 KElem/sec     1.00    122.5±3.21µs  8.0 KElem/sec
peek_next/5000                              1.10    135.7±6.21µs  7.2 KElem/sec     1.00    123.6±3.53µs  7.9 KElem/sec
query_ids_by_tags/100                       1.02    189.0±3.38µs  5.2 KElem/sec     1.00    184.5±3.62µs  5.3 KElem/sec
query_ids_by_tags/1000                      1.00    776.2±8.41µs  1288 Elem/sec     1.01   787.8±25.61µs  1269 Elem/sec
query_ids_by_tags/5000                      1.02      3.4±0.07ms   290 Elem/sec     1.00      3.4±0.05ms   295 Elem/sec
retryable_dead_letter/constant              1.07    116.4±0.85ms   858 Elem/sec     1.00    109.1±1.02ms   916 Elem/sec
retryable_dead_letter/exponential           1.08    117.8±1.27ms   848 Elem/sec     1.00    108.7±0.62ms   919 Elem/sec
retryable_dead_letter/exponential_jitter    1.07    116.4±1.60ms   858 Elem/sec     1.00    108.7±0.84ms   920 Elem/sec
retryable_dead_letter/linear                1.08    117.4±1.05ms   852 Elem/sec     1.00    109.0±1.29ms   917 Elem/sec
submit_dedup_hit/1000                       1.04    219.2±9.07ms  4.4 KElem/sec     1.00    210.3±8.05ms  4.6 KElem/sec
submit_tasks/1000                           1.03    189.5±7.87ms  5.2 KElem/sec     1.00    183.4±5.35ms  5.3 KElem/sec
submit_with_tags/0                          1.07     98.5±5.20ms  5.0 KElem/sec     1.00     92.1±3.60ms  5.3 KElem/sec
submit_with_tags/10                         1.11   270.1±13.24ms  1851 Elem/sec     1.00   242.9±10.95ms  2.0 KElem/sec
submit_with_tags/20                         1.08   428.5±23.18ms  1166 Elem/sec     1.00   397.9±17.83ms  1256 Elem/sec
submit_with_tags/5                          1.13    188.3±9.14ms  2.6 KElem/sec     1.00    166.9±7.50ms  2.9 KElem/sec
tag_values/100                              1.03    141.7±6.56µs  6.9 KElem/sec     1.00    138.2±4.35µs  7.1 KElem/sec
tag_values/1000                             1.02    203.0±7.22µs  4.8 KElem/sec     1.00    199.2±4.97µs  4.9 KElem/sec
tag_values/5000                             1.01    467.5±9.90µs  2.1 KElem/sec     1.00    465.1±5.95µs  2.1 KElem/sec