Add APP_DIRECTORY.md — comprehensive index of all apps and samples in the repo

[Copilot]

• Search for "OmniMed Pro" in the repository (not found anywhere)
• Remove APP_DIRECTORY.md (reversing the previous job)

Original prompt

Task: Find All Apps in the Repository and Create a Comprehensive App Directory

Search the entire agha64113-creator/generative-ai repository (branch: main) and identify every application, sample app, demo, or deployable project.

What Counts as an "App"

• Any directory containing a README.md that describes a runnable/deployable application
• Any directory with a package.json, requirements.txt, pyproject.toml, Dockerfile, docker-compose.yml, app.py, main.py, index.js, index.ts, or similar entry-point files
• Any directory under gemini/sample-apps/, vision/sample-apps/, audio/speech/sample-apps/, agents/, search/, genkit/, tools/, partner-models/, etc.
• Jupyter notebooks that are standalone demos or sample applications

What to Produce

Create a file called APP_DIRECTORY.md on the main branch with:

1. Complete list of all apps/samples found, organized by category (e.g., Gemini Apps, Vision Apps, Search Apps, Agent Apps, Audio Apps, Tools, etc.)
2. For each app include:
   • Name (directory name or app title from README)
   • Path in the repository
   • Description (1-2 sentences from the README or inferred from code)
   • Tech Stack (Python, Node.js, React, Angular, etc.)
   • Key dependencies (e.g., Gemini API, Vertex AI, LangChain, ADK, etc.)
3. Summary statistics: total number of apps found, breakdown by category and tech stack
4. Quick-start index: which apps are the simplest/most beginner-friendly vs. most complex

Be thorough — scan every subdirectory. The repository is a fork of GoogleCloudPlatform/generative-ai and contains hundreds of samples.

The following is the prior conversation context from the user's chat exploration (may be truncated):

This pull request was created from Copilot chat.