docs: fix plugin config + store + dependency docs

PLUGIN_STORE_GUIDE.md
- 19 occurrences of port 5050 -> 5000
- All API paths missing /v3 (e.g. /api/plugins/install ->
  /api/v3/plugins/install). Bulk fix.

PLUGIN_REGISTRY_SETUP_GUIDE.md
- Same port + /api/v3 fixes (3 occurrences each)
- "Go to Plugin Store tab" -> "Open the Plugin Manager tab and scroll
  to the Install from GitHub section" (the real flow for registry
  setup is the GitHub install section, not the Plugin Store search)

PLUGIN_CONFIG_QUICK_START.md
- Port 5001 -> 5000 (5001 is the dev_server.py default, not the web UI)
- "Plugin Store tab" install flow -> real Plugin Manager + Plugin Store
  section + per-plugin tab in second nav row
- Removed reference to PLUGIN_CONFIG_TABS_SUMMARY.md (archived doc)

PLUGIN_CONFIGURATION_TABS.md
- "Plugin Management vs Configuration" section confusingly described
  a "Plugins Tab" that doesn't exist as a single thing. Rewrote to
  describe the real two-piece structure: Plugin Manager tab (browse,
  install, toggle) vs per-plugin tabs (configure individual plugins).

PLUGIN_DEPENDENCY_GUIDE.md
- Port 5001 -> 5000

PLUGIN_DEPENDENCY_TROUBLESHOOTING.md
- Wrong port (8080) and wrong UI nav ("Plugin Store or Plugin
  Management"). Fixed to the real flow.

PLUGIN_QUICK_REFERENCE.md
- "Plugin Location: ./plugins/ directory" -> default is plugin-repos/
  (verified in config/config.template.json:130 and
  display_controller.py:132). plugins/ is a fallback.
- File structure diagram showed plugins/ -> plugin-repos/.
- Web UI install flow: "Plugin Store tab" -> "Plugin Manager tab ->
  Plugin Store section". Also fixed Configure ⚙️ button (doesn't
  exist) and "Drag and drop reorder" (not implemented).
- API examples: replaced ad-hoc Python pseudocode with real curl
  examples against /api/v3/plugins/* endpoints. Pointed at
  REST_API_REFERENCE.md for the full list.
- "Migration Path Phase 1-5" was a roadmap written before the plugin
  system shipped. The plugin system is now stable and live. Removed
  the migration phases as they're history, not a roadmap.
- "Quick Migration" section called scripts/migrate_to_plugins.py
  which doesn't exist anywhere in the repo. Removed.
- "Plugin Registry Structure" referenced
  ChuckBuilds/ledmatrix-plugin-registry which doesn't exist. The
  real registry is ChuckBuilds/ledmatrix-plugins. Fixed.
- "Next Steps" / "Questions to Resolve" sections were
  pre-implementation planning notes. Replaced with a "Known
  Limitations" section that documents the actually-real gaps
  (sandboxing, resource limits, ratings, auto-updates).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/PLUGIN_CONFIG_QUICK_START.md

@@ -4,13 +4,14 @@
 
 ### For Users
 
-1. Open the web interface: `http://your-pi-ip:5001`
-2. Go to the **Plugin Store** tab
-3. Install a plugin (e.g., "Hello World")
-4. Notice a new tab appears with the plugin's name
-5. Click on the plugin's tab to configure it
-6. Modify settings and click **Save Configuration**
-7. Restart the display to see changes
+1. Open the web interface: `http://your-pi-ip:5000`
+2. Open the **Plugin Manager** tab
+3. Find a plugin in the **Plugin Store** section (e.g., "Hello World")
+   and click **Install**
+4. Notice a new tab appears in the second nav row with the plugin's name
+5. Click that tab to configure the plugin
+6. Modify settings and click **Save**
+7. From **Overview**, click **Restart Display Service** to see changes
 
 That's it! Each installed plugin automatically gets its own configuration tab.
 
@@ -171,9 +172,11 @@ User enters: `255, 0, 0`
 ### For Users
 
 1. **Reset Anytime**: Use "Reset to Defaults" to restore original settings
-2. **Navigate Back**: Click "Back to Plugin Management" to return to Plugins tab
+2. **Navigate Back**: Switch to the **Plugin Manager** tab to see the
+   full list of installed plugins
 3. **Check Help Text**: Each field has a description explaining what it does
-4. **Restart Required**: Remember to restart the display after saving
+4. **Restart Required**: Remember to restart the display service from
+   **Overview** after saving
 
 ### For Developers
 
@@ -206,8 +209,10 @@ User enters: `255, 0, 0`
 ## 📚 Next Steps
 
 - Read the full documentation: [PLUGIN_CONFIGURATION_TABS.md](PLUGIN_CONFIGURATION_TABS.md)
-- Check implementation details: [PLUGIN_CONFIG_TABS_SUMMARY.md](PLUGIN_CONFIG_TABS_SUMMARY.md)
-- Browse example plugins: `plugins/hello-world/`, `plugins/clock-simple/`
+- Check the configuration architecture: [PLUGIN_CONFIG_ARCHITECTURE.md](PLUGIN_CONFIG_ARCHITECTURE.md)
+- Browse example plugins in the
+  [ledmatrix-plugins](https://github.com/ChuckBuilds/ledmatrix-plugins)
+  repo, especially `plugins/hello-world/` and `plugins/clock-simple/`
 - Join the community for help and suggestions
 
 ## 🎉 That's It!