refactor: rename the application package to docsgpt

The backend import package is now docsgpt, the name it will carry on PyPI;
application was far too generic to install into anyone's site-packages.
git mv plus a mechanical rewrite of every import, dotted string and path
reference: 734 Python files, the compose files, Dockerfile, workflows, docs,
setup scripts, devcontainer, k8s manifests, vscode config, pytest and coverage
config, .gitignore. Behaviour is unchanged.

Kept for one release:
- A top-level application package whose meta-path finder resolves
  application.x.y to the already-imported docsgpt.x.y object, so old imports
  and entry points (celery -A application.app.celery,
  uvicorn application.asgi:asgi_app) keep working with a FutureWarning.
- Celery registers every application.* task name as an alias of its
  docsgpt.* task on start-up, so messages queued by the previous release still
  run. The redbeat key prefix moves to redbeat:docsgpt:v2: so schedule entries
  the previous release wrote are left unread instead of firing twice.

The backend image builds from the repository root (docker build -f
docsgpt/Dockerfile .) so it can ship the alias package; a root .dockerignore
allow-lists docsgpt/ and application/ and keeps caches, local data, .env
files, the sample index files and the Dockerfile out. Compose and the image
workflows point at the new context.

docs/content/Tools/basics.mdx

@@ -38,37 +38,37 @@ DocsGPT includes a suite of pre-built tools designed to expand its capabilities
     },
     {
       title: 'Brave Search',
-      link: 'https://github.com/arc53/DocsGPT/blob/main/application/agents/tools/brave.py',
+      link: 'https://github.com/arc53/DocsGPT/blob/main/docsgpt/agents/tools/brave.py',
       description: 'Enables DocsGPT to perform real-time web and image searches using the Brave Search API. Requires an API key.'
     },
     {
       title: 'DuckDuckGo Search',
-      link: 'https://github.com/arc53/DocsGPT/blob/main/application/agents/tools/duckduckgo.py',
+      link: 'https://github.com/arc53/DocsGPT/blob/main/docsgpt/agents/tools/duckduckgo.py',
       description: 'Performs web and image searches using DuckDuckGo. No API key required.'
     },
     {
       title: 'CryptoPrice',
-      link: 'https://github.com/arc53/DocsGPT/blob/main/application/agents/tools/cryptoprice.py',
+      link: 'https://github.com/arc53/DocsGPT/blob/main/docsgpt/agents/tools/cryptoprice.py',
       description: 'Fetches the current price of specified cryptocurrencies using the CryptoCompare public API.'
     },
     {
       title: 'Ntfy',
-      link: 'https://github.com/arc53/DocsGPT/blob/main/application/agents/tools/ntfy.py',
+      link: 'https://github.com/arc53/DocsGPT/blob/main/docsgpt/agents/tools/ntfy.py',
       description: 'Allows DocsGPT to send push notifications to ntfy topics on a specified server, ideal for alerts and updates.'
     },
     {
       title: 'Telegram Bot',
-      link: 'https://github.com/arc53/DocsGPT/blob/main/application/agents/tools/telegram.py',
+      link: 'https://github.com/arc53/DocsGPT/blob/main/docsgpt/agents/tools/telegram.py',
       description: 'Allows DocsGPT to send messages or images to Telegram chats via a Telegram Bot. Requires a bot token and chat ID.'
     },
     {
       title: 'PostgreSQL Database',
-      link: 'https://github.com/arc53/DocsGPT/blob/main/application/agents/tools/postgres.py',
+      link: 'https://github.com/arc53/DocsGPT/blob/main/docsgpt/agents/tools/postgres.py',
       description: 'Connects to a PostgreSQL database to execute SQL queries and retrieve schema information.'
     },
     {
       title: 'Read Webpage (browser)',
-      link: 'https://github.com/arc53/DocsGPT/blob/main/application/agents/tools/read_webpage.py',
+      link: 'https://github.com/arc53/DocsGPT/blob/main/docsgpt/agents/tools/read_webpage.py',
       description: 'Fetches the HTML content of a URL and converts it to Markdown for the agent to read.'
     },
     {
@@ -83,17 +83,17 @@ DocsGPT includes a suite of pre-built tools designed to expand its capabilities
     },
     {
       title: 'Memory',
-      link: 'https://github.com/arc53/DocsGPT/blob/main/application/agents/tools/memory.py',
+      link: 'https://github.com/arc53/DocsGPT/blob/main/docsgpt/agents/tools/memory.py',
       description: 'Stores and retrieves information across conversations through a per-user memory file directory.'
     },
     {
       title: 'Notepad',
-      link: 'https://github.com/arc53/DocsGPT/blob/main/application/agents/tools/notes.py',
+      link: 'https://github.com/arc53/DocsGPT/blob/main/docsgpt/agents/tools/notes.py',
       description: 'A single editable note. Supports viewing, overwriting, and string replacement.'
     },
     {
       title: 'Todo List',
-      link: 'https://github.com/arc53/DocsGPT/blob/main/application/agents/tools/todo_list.py',
+      link: 'https://github.com/arc53/DocsGPT/blob/main/docsgpt/agents/tools/todo_list.py',
       description: 'Manages todo items — creating, viewing, updating, and deleting todos.'
     }
   ]}

docs/content/Tools/creating-a-tool.mdx

@@ -27,7 +27,7 @@ While DocsGPT offers a range of built-in tools and a versatile API Tool, there a
 Before you begin, ensure you have:
 
 * A solid understanding of Python programming.
-* Familiarity with the DocsGPT project structure, particularly the `application/agents/tools/` directory where custom tools reside.
+* Familiarity with the DocsGPT project structure, particularly the `docsgpt/agents/tools/` directory where custom tools reside.
 * Basic knowledge of how APIs work, as many tools involve interacting with external or internal APIs.
 * Your DocsGPT development environment set up. If not, please refer to the [Setting Up a Development Environment](/Deploying/Development-Environment) guide.
 
@@ -35,7 +35,7 @@ Before you begin, ensure you have:
 
 Custom tools in DocsGPT are Python classes that inherit from a base `Tool` class and implement specific methods to define their behavior, capabilities, and configuration needs.
 
-The **foundation** for all custom tools is the abstract base class, located in `application/agents/tools/base.py`. Your custom tool class **must** inherit from this class.
+The **foundation** for all custom tools is the abstract base class, located in `docsgpt/agents/tools/base.py`. Your custom tool class **must** inherit from this class.
 
 ### Essential Methods to Implement
 
@@ -150,11 +150,11 @@ Your custom tool class needs to implement the following methods:
 
 ## Tool Registration and Discovery
 
-DocsGPT's ToolManager (located in application/agents/tools/tool_manager.py) automatically discovers and loads tools.
+DocsGPT's ToolManager (located in docsgpt/agents/tools/tool_manager.py) automatically discovers and loads tools.
 
 As long as your custom tool:
 
-1. Is placed in a Python file within the `application/agents/tools/` directory (and the filename is not `base.py` or starts with `__`).
+1. Is placed in a Python file within the `docsgpt/agents/tools/` directory (and the filename is not `base.py` or starts with `__`).
 2. Correctly inherits from the `Tool` base class.
 3. Implements all the abstract methods (`execute_action`, `get_actions_metadata`, `get_config_requirements`).