Bump to 0.2.0 with the webinterface-removal changelog

Project version goes from 0.1.2 to 0.2.0 — a minor bump rather than a
patch because the webinterface removal is a behavioural change for
anyone who relied on it. csproj, plugin manifest yaml and the
custom-repo repo.json are all moved over together so the Dalamud
plugin list, the manifest and the download links agree.

The yaml description picks up a leading paragraph that names the
removal up front; pre-installation users see it in the Dalamud
plugin browser. Both yaml and repo.json gain a 0.2.0 changelog block
that explains the audit context, lists every concrete code change
and reassures that the privacy filter, retention sweep, first-run
wizard and exporter are untouched. Older changelog entries are
preserved in chronological order behind it.

repo.json AssemblyVersion and TestingAssemblyVersion go to 0.2.0.0
and the three download links point at v0.2.0/latest.zip; the tag
itself is created by hand alongside the GitHub release.

Build (Release) produces ChatTwo/bin/Release/HellionChat/latest.zip
(~17 MB) and HellionChat.json with no warnings.

ChatTwo/ChatTwo.csproj

@@ -4,7 +4,7 @@
              0.1.0 is our bootstrap release; the underlying Chat 2 base is
              called out in the yaml changelog so users can see what it
              derives from. -->
-        <Version>0.1.2</Version>
+        <Version>0.2.0</Version>
         <ImplicitUsings>enable</ImplicitUsings>
         <!-- HellionChat fork: assembly is renamed so Dalamud uses
              pluginConfigs/HellionChat instead of pluginConfigs/ChatTwo,

ChatTwo/HellionChat.yaml

@@ -2,10 +2,13 @@ name: Hellion Chat
 author: JonKazama-Hellion
 punchline: Chat 2 with privacy controls aligned to EU, US and JP rules
 description: |-
-  Hellion Chat is built on top of Chat 2 — every Chat 2 feature, command
-  and shortcut you already know works the same. The /chat2 command, tabs,
-  channel filters, RGB colours, emotes, screenshot mode, IPC integration
-  and the chat replacement window itself are all unchanged.
+  Hellion Chat is built on top of Chat 2 with one removal and a stack
+  of privacy controls on top. The /chat2 command, tabs, channel
+  filters, RGB colours, emotes, screenshot mode, IPC integration and
+  the chat replacement window itself work the same. The optional
+  webinterface that Chat 2 ships is intentionally not part of this
+  fork because it could not be hardened to the privacy guarantees
+  Hellion Chat makes by default.
 
   On top of that, Hellion Chat adds privacy and data-handling controls
   designed to align with the modern data protection rules that apply
@@ -37,6 +40,44 @@ tags:
   - Replacement
   - Privacy
 changelog: |-
+  **Hellion Chat 0.2.0 — Webinterface removed**
+
+  Following an internal security and consistency audit the upstream
+  webinterface has been removed in its entirety. Hardening it to the
+  privacy guarantees Hellion Chat makes by default would have meant
+  rewriting the auth flow (the upstream code uses a five-digit
+  numeric code from System.Random), changing the default bind address
+  (currently every interface), reworking cookie handling and adding
+  the privacy filter to the live message stream that the webinterface
+  was broadcasting around it. The cumulative cost did not match the
+  niche use case for a fork that wants less network surface, not more.
+
+  What changed in this release:
+
+  - Settings tab "Webinterface" is gone, the corresponding
+    Configuration fields (WebinterfaceEnabled / AutoStart / Password /
+    Port / AuthStore / MaxLinesToSend) are dropped and stale entries
+    fall out of the JSON on the next save automatically
+  - The whole ChatTwo/Http tree, the bundled Svelte frontend in
+    websiteBuild.zip and the WebinterfaceUtil helper are deleted
+  - Watson.Lite (the HTTP server) and Newtonsoft.Json (only used by
+    the webinterface JSON wire format) are removed from the
+    package references
+  - DbViewer's "Chat2 JSON Export" button is dropped because it
+    serialised the database into the webinterface message protocol;
+    the Privacy tab's MessageExporter (Markdown, JSON, CSV with
+    channel and date filters) covers the same ground without the
+    proprietary shape
+  - About tab notes the absence so users coming from Chat 2 do not
+    look for it
+  - Configuration version bumps from 7 to 8 with a one-shot
+    notification (EN + DE)
+
+  No changes to the privacy filter, retention sweep, first-run wizard
+  or export pipeline. Existing chat history is preserved.
+
+  Based on Chat 2 1.35.3 (upstream Infiziert90/ChatTwo, EUPL-1.2).
+
   **Hellion Chat 0.1.2 — About tab rebrand, DBViewer polish**
 
   - About tab now shows Hellion-specific maintainer, license, EU/US/JP