dynamic router switching

[cody-littley]

Describe your changes and provide context

Add the ability to change router type at runtime. Allows us to initiate migration at times other than upgrade boundaries (assuming we have control plane infrastructure that can decide when to initiate upgrade).

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jun 12, 2026, 6:36 PM

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.34%. Comparing base (9e65d8e) to head (d401db2).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
sei-cosmos/storev2/rootmulti/store.go	89.47%	1 Missing and 1 partial ⚠️
app/seidb.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3581      +/-   ##
==========================================
- Coverage   59.18%   58.34%   -0.85%     
==========================================
  Files        2214     2140      -74     
  Lines      183402   174876    -8526     
==========================================
- Hits       108549   102030    -6519     
+ Misses      65047    63745    -1302     
+ Partials     9806     9101     -705     

Flag	Coverage Δ
sei-chain-pr	61.31% <87.50%> (?)
sei-db	70.41% <ø> (ø)
sei-db-state-db	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sei-cosmos/server/config/config.go	94.53% <100.00%> (ø)
sei-cosmos/storev2/commitment/store.go	54.08% <100.00%> (+0.95%)	⬆️
sei-db/config/sc_config.go	87.50% <100.00%> (ø)
app/seidb.go	73.61% <0.00%> (ø)
sei-cosmos/storev2/rootmulti/store.go	67.72% <89.47%> (+0.67%)	⬆️

... and 74 files with indirect coverage changes

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