docs: update ARCHITECTURE.md - fix CI/CD table, remove stale diagram refs, update data models

- CI/CD table: add docs-check.yml and licence-check.yml, correct build-image.yml trigger (release/** + develop, not main)
- Section 13 intro: clarify no PNG exports or external tooling required
- Download class diagram: add canBlocklist, addedOn, arrQueueId, arrType, arrInstanceUrl, arrContentId, arrContentType fields
- qBittorrentTorrent class diagram: add added_on field
- Remove docs/diagrams/ directory (PNG exports superseded by embedded Mermaid)

docs/ARCHITECTURE.md

@@ -901,21 +901,23 @@ volumes:
 
 ### CI / CD
 
-The `.gitea/workflows/` directory contains three pipeline definitions:
+The `.gitea/workflows/` directory contains five pipeline definitions:
 
 | File | Trigger | Purpose |
 |------|---------|--------|
-| `ci.yml` | Every push / PR | Security audit (`npm audit --audit-level=high`) + tests with V8 coverage |
-| `build-image.yml` | Push to `main` / `develop` | Build and push Docker image to `docker.i3omb.com` |
-| `create-release.yml` | Tag push (`v*`) | Create a Gitea release |
+| `ci.yml` | Every push / PR (all branches) | Security audit (`npm audit --audit-level=high`) + tests with V8 coverage |
+| `build-image.yml` | Push to `release/**` or `develop` | Build and push Docker image to `reg.i3omb.com`. `release/**` pushes versioned + `latest` tags; `develop` pushes a `:develop` tag. |
+| `create-release.yml` | Tag push (`v*`) | Generate release notes from git log and create a Gitea release |
+| `docs-check.yml` | Push / PR touching `**.md` (non-main / non-release branches) | Markdown lint + Mermaid diagram parse validation |
+| `licence-check.yml` | Push / PR touching `package.json` or `package-lock.json` | Verify all production dependency licences are compatible with MIT |
 
-> **Diagrams** are written in Mermaid and render natively in Gitea — no CI workflow required. See [Section 13](#13-diagrams).
+> **Diagrams** are written in Mermaid and render natively in Gitea — no separate diagram files or CI render step required. See [Section 13](#13-diagrams).
 
 ---
 
 ## 13. Diagrams
 
-All diagrams are written in [Mermaid](https://mermaid.js.org/) and render natively in Gitea and GitHub markdown.
+All diagrams are written in [Mermaid](https://mermaid.js.org/) and render natively in Gitea and GitHub markdown. No external tooling or PNG exports are required — the source is the diagram.
 
 ### 13.1 Component Diagram
 
@@ -1302,6 +1304,13 @@ classDiagram
         +availability string
         +hash string
         +completedAt string
+        +canBlocklist boolean
+        +addedOn number
+        +arrQueueId number
+        +arrType string
+        +arrInstanceUrl string
+        +arrContentId number
+        +arrContentType string
     }
     class TagBadge {
         +label string
@@ -1346,6 +1355,7 @@ classDiagram
         +num_seeds number
         +num_leechs number
         +availability number
+        +added_on number
     }
     class SonarrQueueRecord {
         +seriesId number