Remove filesystem API spec doc

src/backend/doc/modules/filesystem/API_SPEC.md

@@ -1,69 +0,0 @@
-# Filesystem API
-
-Filesystem endpoints allow operations on files and directories in the Puter filesystem.
-
-## POST `/mkdir` (auth required)
-
-### Description
-
-Creates a new directory in the filesystem. Currently support 2 formats:
-
-- Full path: `{"path": "/foo/bar", args ...}` — this API is used by apitest (`./tools/api-tester/apitest.js`) and aligns more closely with the POSIX spec (https://linux.die.net/man/3/mkdir)
-- Parent + path: `{"parent": "/foo", "path": "bar", args ...}` — this API is used by `puter-js` via `puter.fs.mkdir`
-
-A future work would be use a unified format for all filesystem operations.
-
-### Parameters
-
-- **path** _- required_
-  - **accepts:** `string`
-  - **description:** The path where the directory should be created
-  - **notes:** Cannot be empty, null, or undefined
-
-- **parent** _- optional_
-  - **accepts:** `string | UUID`
-  - **description:** The parent directory path or UUID
-  - **notes:** If not provided, path is treated as full path
-
-- **overwrite** _- optional_
-  - **accepts:** `boolean`
-  - **default:** `false`
-  - **description:** Whether to overwrite existing files/directories
-
-- **dedupe_name** _- optional_
-  - **accepts:** `boolean`
-  - **default:** `false`
-  - **description:** Whether to automatically rename if name exists
-
-- **create_missing_parents** _- optional_
-  - **accepts:** `boolean`
-  - **default:** `false`
-  - **description:** Whether to create parent directories if they don't exist
-  - **aliases:** `create_missing_ancestors`
-
-- **shortcut_to** _- optional_
-  - **accepts:** `string | UUID`
-  - **description:** Creates a shortcut/symlink to the specified target
-
-### Example
-
-```json
-{
-  "path": "/user/Desktop/new-directory"
-}
-```
-
-```json
-{
-  "parent": "/user",
-  "path": "Desktop/new-directory"
-}
-```
-
-### Response
-
-Returns the created directory's metadata including name, path, uid, and any parent directories created.
-
-## Other Filesystem Endpoints
-
-[Additional endpoints would be documented here...]