chore: bump version to 1.4.5

Manifest sync across csproj, yaml, repo.json, README, CHANGELOG,
ROADMAP and the Plugin.cs schema-gate error message. ROADMAP also gets
the v1.4.4 release block that was missed in that cycle's closure.

Forge-post v1.4.5.md follows the established frontmatter + DE-body
convention; the EN block is sourced from the yaml changelog by the
forge-announce workflow.

HellionChat/HellionChat.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Dalamud.NET.Sdk/15.0.0">
     <PropertyGroup>
         <!-- Independent versioning; see yaml changelog for upstream Chat 2 base -->
-        <Version>1.4.4</Version>
+        <Version>1.4.5</Version>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
         <!-- Use lock file to pin exact versions -->