NOISSUE - Rename domains to workspaces

[ianmuchyri]

Summary

• rename the Magistrala tenant/isolation concept from domains to workspaces across core API, SDK, CLI, auth/session policy plumbing, docker/env, permissions, SpiceDB schema, docs, and migration tooling
• move gRPC/OpenAPI/proto surfaces from domains to workspaces and regenerate protobuf outputs
• update dependent service routes, SDK parameters, tests, and generated mocks for workspace naming

Verification

• make proto
• go test -run '^$' ./pkg/sdk ./pkg/atom ./pkg/grpcclient ./readers/api/http ./auth ./cli
• docker compose config validation
• git diff --check

Notes

• Runtime tests that bind localhost or require Docker/Redis were blocked in the local sandbox.
• make mocks did not resolve the configured interfaces with the available mockery version; SDK mocks were updated mechanically.

[codecov]

Codecov Report

❌ Patch coverage is 34.53865% with 525 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.00%. Comparing base (1f91de4) to head (526247e).
⚠️ Report is 683 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/sdk/groups.go	0.00%	62 Missing ⚠️
pkg/messaging/topics.go	0.00%	58 Missing ⚠️
pkg/sdk/clients.go	0.00%	56 Missing ⚠️
pkg/sdk/bootstrap.go	0.00%	34 Missing ⚠️
pkg/sdk/channels.go	0.00%	34 Missing ⚠️
auth/postgres/repo.go	0.00%	31 Missing ⚠️
pkg/sdk/workspaces.go	70.45%	13 Missing and 13 partials ⚠️
pkg/sdk/reports.go	0.00%	23 Missing ⚠️
pkg/sdk/certs.go	0.00%	18 Missing ⚠️
pkg/sdk/rules.go	0.00%	18 Missing ⚠️
... and 34 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3594       +/-   ##
===========================================
+ Coverage   21.34%   43.00%   +21.65%     
===========================================
  Files         147      189       +42     
  Lines       26244    15030    -11214     
===========================================
+ Hits         5601     6463      +862     
+ Misses      20149     7972    -12177     
- Partials      494      595      +101     

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