Migrate residual URLs and security-report path to Forge

Cleanup pass after the v1.4.3 cutover. Five files still carried
gitea.com hosts or dead github.com security-advisory links because
they were not touched in the prior URL sweep.

- forge-announce.yml: Discord embed avatar and tag link
- release-footer.md: custom-repo URL plus six doc/license links
- bug_report.yml, config.yml, PULL_REQUEST_TEMPLATE.md: replace
  github.com/.../security/advisories/new with mailto:kontakt@
  hellion-media.de. Gitea has no privately-reportable advisory
  feature; e-mail is the closest functional equivalent.

Pure string replacement, no logic change.

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -8,7 +8,7 @@ body:
       value: |
         Thanks for reporting. Please fill in the fields below so I can
         reproduce the issue. If this is a security issue, stop here and
-        use the [private vulnerability advisory](https://github.com/JonKazama-Hellion/HellionChat/security/advisories/new)
+        report it privately to [kontakt@hellion-media.de](mailto:kontakt@hellion-media.de?subject=%5BHellionChat%20Security%5D)
         instead.
 
   - type: input

.github/ISSUE_TEMPLATE/config.yml

@@ -2,8 +2,8 @@ blank_issues_enabled: false
 
 contact_links:
   - name: Security vulnerability
-    url: https://github.com/JonKazama-Hellion/HellionChat/security/advisories/new
-    about: Do not open a public issue for security problems. Use the private advisory instead.
+    url: mailto:kontakt@hellion-media.de?subject=%5BHellionChat%20Security%5D
+    about: Do not open a public issue for security problems. Report by e-mail instead.
 
   - name: Upstream Chat 2 issue
     url: https://github.com/Infiziert90/ChatTwo/issues

.github/PULL_REQUEST_TEMPLATE.md

@@ -3,9 +3,9 @@ Thanks for contributing to HellionChat. Please fill in the sections
 below so the review goes quickly. Delete sections that genuinely do
 not apply, but do not delete the whole template.
 
-If this is a security fix, stop here and use a private security
-advisory instead:
-https://github.com/JonKazama-Hellion/HellionChat/security/advisories/new
+If this is a security fix, stop here and report it privately by
+e-mail instead of opening a public PR:
+mailto:kontakt@hellion-media.de?subject=%5BHellionChat%20Security%5D
 -->
 
 ## Summary

.github/release-footer.md

@@ -8,19 +8,19 @@ Dalamud main plugin repo. To install:
 
 1. In XIVLauncher: **Settings → Experimental → Custom Plugin Repositories**
 2. Add the URL:
-   `https://gitea.com/JonKazama-Hellion/HellionChat/raw/branch/main/repo.json`
+   `https://gitea.hellion-forge.cloud/JonKazama-Hellion/HellionChat/raw/branch/main/repo.json`
 3. Enable, save, then `/xlplugins` → search **Hellion Chat** → install
 
 ## Project documents
 
-- [README](https://gitea.com/JonKazama-Hellion/HellionChat/src/branch/main/README.md) — features, architecture, build
-- [Privacy notice](https://gitea.com/JonKazama-Hellion/HellionChat/src/branch/main/PRIVACY.md) — what the plugin stores and sends
-- [Third-party notices](https://gitea.com/JonKazama-Hellion/HellionChat/src/branch/main/docs/THIRD_PARTY_NOTICES.md) — dependencies and licences
-- [Security policy](https://gitea.com/JonKazama-Hellion/HellionChat/src/branch/main/SECURITY.md) — vulnerability reporting
-- [Support](https://gitea.com/JonKazama-Hellion/HellionChat/src/branch/main/SUPPORT.md) — bug reports, questions, contact paths
+- [README](https://gitea.hellion-forge.cloud/JonKazama-Hellion/HellionChat/src/branch/main/README.md) — features, architecture, build
+- [Privacy notice](https://gitea.hellion-forge.cloud/JonKazama-Hellion/HellionChat/src/branch/main/PRIVACY.md) — what the plugin stores and sends
+- [Third-party notices](https://gitea.hellion-forge.cloud/JonKazama-Hellion/HellionChat/src/branch/main/docs/THIRD_PARTY_NOTICES.md) — dependencies and licences
+- [Security policy](https://gitea.hellion-forge.cloud/JonKazama-Hellion/HellionChat/src/branch/main/SECURITY.md) — vulnerability reporting
+- [Support](https://gitea.hellion-forge.cloud/JonKazama-Hellion/HellionChat/src/branch/main/SUPPORT.md) — bug reports, questions, contact paths
 
 ## Licence
 
-[EUPL-1.2](https://gitea.com/JonKazama-Hellion/HellionChat/src/branch/main/LICENSE).
+[EUPL-1.2](https://gitea.hellion-forge.cloud/JonKazama-Hellion/HellionChat/src/branch/main/LICENSE).
 Based on [Chat 2](https://github.com/Infiziert90/ChatTwo) by Infi and Anna,
 also EUPL-1.2.

.github/workflows/forge-announce.yml

@@ -133,7 +133,7 @@ jobs:
           # ---------- Embed-Payload bauen ----------
           $payload = [ordered]@{
               username = "Forge Herald"
-              avatar_url = "https://gitea.com/JonKazama-Hellion/HellionChat/raw/branch/main/HellionChat/images/icon.png"
+              avatar_url = "https://gitea.hellion-forge.cloud/JonKazama-Hellion/HellionChat/raw/branch/main/HellionChat/images/icon.png"
               content = "<@&1500489631555260446>"
               allowed_mentions = [ordered]@{
                   parse = @()
@@ -142,7 +142,7 @@ jobs:
               embeds = @(
                   [ordered]@{
                       title = $title
-                      url = "https://gitea.com/JonKazama-Hellion/HellionChat/releases/tag/$tag"
+                      url = "https://gitea.hellion-forge.cloud/JonKazama-Hellion/HellionChat/releases/tag/$tag"
                       color = 12730636
                       description = $description
                       footer = [ordered]@{ text = $footerText }