Add users, roles, and per-novel permissions

Introduces accounts (ASP.NET Identity + cookie auth), four global
roles (Admin/Writer/Editor/Reviewer), per-novel ownership and grants
via ProjectMember, and a service-API-key principal for the MCP server
and background import jobs. Enforcement lives in the application
services (not endpoint filters) so the embedded agent and MCP tools,
which call the same services directly, can't bypass it. Web client
gets a login page, session-aware routing, and a People section for
managing per-novel access.

Also includes prior in-flight changes from this branch (CLAUDE.md
compliance pass, dev-deploy docker-compose setup) that were
uncommitted when this feature work started.

scripts/ci/prepush.sh

@@ -8,11 +8,18 @@ cd "$CI_ROOT"
 ensure_dotnet
 ensure_node
 
+log "Checking for comments in C#/TS/TSX/CSS"
+./scripts/ci/check-no-comments.sh
+
 log "Building the solution (Debug)"
 dotnet build Novelly.slnx -c Debug
 
-log "Running Novelly.Api.Tests"
-dotnet test tests/Novelly.Api.Tests/Novelly.Api.Tests.csproj -c Debug
+log "Running Novelly.Api.Tests with a line-coverage floor"
+dotnet test tests/Novelly.Api.Tests/Novelly.Api.Tests.csproj -c Debug \
+  /p:CollectCoverage=true /p:CoverletOutputFormat=cobertura \
+  /p:Exclude="[Novelly.ServiceDefaults]*" \
+  /p:ExcludeByFile="**/Data/Migrations/*.cs" \
+  /p:Threshold=60 /p:ThresholdType=line /p:ThresholdStat=total
 
 log "Installing web dependencies (npm ci)"
 npm --prefix src/Novelly.Web ci