docs: add PocketBase Bot command reference

docs/pocketbase-bot.md

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+## 🤖 PocketBase Bot — Command Reference
+
+> Available to **org members only** (Contributors team).
+> Trigger by posting a comment on any Issue or PR.
+
+---
+
+### 🔧 Field Updates
+Simple key=value pairs. Multiple in one line.
+```
+/pocketbase <slug> field=value [field=value ...]
+```
+**Boolean fields** (`true`/`false`): `updateable` `privileged` `has_arm` `is_dev` `is_disabled` `is_deleted`
+**Text fields**: `name` `description` `logo` `documentation` `website` `project_url` `github` `config_path` `disable_message` `deleted_message`
+**Number**: `port`
+**Nullable**: `default_user` `default_passwd` *(empty value = null: `default_passwd=`)*
+
+**Examples:**
+```
+/pocketbase homeassistant is_disabled=true disable_message="Broken upstream"
+/pocketbase homeassistant documentation=https://www.home-assistant.io/docs
+/pocketbase homeassistant is_dev=false
+/pocketbase homeassistant default_passwd=
+```
+
+---
+
+### 📝 set — HTML / Multiline / Special Characters
+Use a code block for values that contain HTML, links, quotes or newlines.
+````
+/pocketbase <slug> set <field>
+```
+Your content here — HTML tags, links, quotes, all fine
+```
+````
+**Allowed fields:** `name` `description` `logo` `documentation` `website` `project_url` `github` `config_path` `disable_message` `deleted_message`
+
+---
+
+### 🗒️ Notes
+```
+/pocketbase <slug> note list
+/pocketbase <slug> note add <type> "<text>"
+/pocketbase <slug> note edit <type> "<old text>" "<new text>"
+/pocketbase <slug> note remove <type> "<text>"
+```
+Note types come from `z_ref_note_types` in PocketBase (e.g. `info`, `warning`).
+If text doesn't match exactly, the bot lists all current notes automatically.
+
+---
+
+### ⚙️ Install Method Resources
+```
+/pocketbase <slug> method list
+/pocketbase <slug> method <type> hdd=10
+/pocketbase <slug> method <type> cpu=4 ram=2048 hdd=20
+```
+`<type>` matches the install method type name (e.g. `default`, `alpine`). Use `method list` to see available types and current values. `ram` = MB, `hdd` = GB.
+
+---
+
+### 💡 Tips
+- The bot reacts with 👀 when it picks up the command, ✅ on success, 👎 on error
+- On any error, a comment explains what went wrong
+- `note edit` / `note remove` show the current note list if the text doesn't match