Add support for prompt variables (bot name, date/time, model id)

Fixes https://github.com/etkecc/baibot/issues/10

This also includes them in the default prompts (for newly-created agents),
so that people can get a better experience out of the box.

docs/configuration/text-generation.md

@@ -68,6 +68,19 @@ Where appropriate, you'll mention best practices and common pitfalls.
 
 A prompt override can also be set globally, see [🛠️ Room Settings](./README.md#room-settings).
 
+Prompts may contain the following **placeholder variables** which will be replaced *every time* the bot is interacted with:
+
+| Placeholder               | Description | Example |
+|---------------------------|-------------|---------|
+| `{{ baibot_name }}`       | Name of the bot as configured in the `user.name` field in the [Static configuration](./README.md#static-configuration) | `Baibot` |
+| `{{ baibot_model_id }}`   | Text-Generation model ID as configured in the [🤖 agent](../agents.md)'s configuration | `gpt-4o` |
+| `{{ baibot_now_utc }}`    | Current date and time in UTC | `2024-09-20 (Friday), 14:26:42 UTC (local timezone/time: unknown)` |
+
+Here's a prompt that combines some of the above variables:
+
+> You are a brief, but helpful bot called {{ baibot_name }} powered by the {{ baibot_model_id }} model. The date/time now is: {{ baibot_now_utc }}."
+
+
 ### 🌡️ Temperature Override
 
 You can override the [temperature](https://blogs.novita.ai/what-are-large-language-model-settings-temperature-top-p-and-max-tokens/#what-is-llm-temperature) (randomness / creativity) parameter configured at the [🤖 agent](../agents.md) level.

docs/sample-provider-configs/anthropic.yml

@@ -2,7 +2,7 @@ base_url: https://api.anthropic.com/v1
 api_key: YOUR_API_KEY_HERE
 text_generation:
   model_id: claude-3-5-sonnet-20240620
-  prompt: You are a brief, but helpful bot.
+  prompt: "You are a brief, but helpful bot called {{ baibot_name }} powered by the {{ baibot_model_id }} model. The date/time now is: {{ baibot_now_utc }}."
   temperature: 1.0
   max_response_tokens: 8192
   max_context_tokens: 204800

docs/sample-provider-configs/groq.yml

@@ -2,7 +2,7 @@ base_url: https://api.groq.com/openai/v1
 api_key: YOUR_API_KEY_HERE
 text_generation:
   model_id: llama3-70b-8192
-  prompt: You are a brief, but helpful bot.
+  prompt: "You are a brief, but helpful bot called {{ baibot_name }} powered by the {{ baibot_model_id }} model. The date/time now is: {{ baibot_now_utc }}."
   temperature: 1.0
   max_response_tokens: 4096
   max_context_tokens: 131072

docs/sample-provider-configs/localai.yml

@@ -2,7 +2,7 @@ base_url: http://my-localai-self-hosted-service:8080/v1
 api_key: YOUR_API_KEY_HERE
 text_generation:
   model_id: gpt-4
-  prompt: You are a brief, but helpful bot.
+  prompt: "You are a brief, but helpful bot called {{ baibot_name }} powered by the {{ baibot_model_id }} model. The date/time now is: {{ baibot_now_utc }}."
   temperature: 1.0
   max_response_tokens: 4096
   max_context_tokens: 128000

docs/sample-provider-configs/mistral.yml

@@ -2,7 +2,7 @@ base_url: https://api.mistral.ai/v1
 api_key: YOUR_API_KEY_HERE
 text_generation:
   model_id: mistral-large-latest
-  prompt: You are a brief, but helpful bot.
+  prompt: "You are a brief, but helpful bot called {{ baibot_name }} powered by the {{ baibot_model_id }} model. The date/time now is: {{ baibot_now_utc }}."
   temperature: 1.0
   max_response_tokens: 4096
   max_context_tokens: 128000

docs/sample-provider-configs/ollama.yml

@@ -2,7 +2,7 @@ base_url: http://my-ollama-self-hosted-service:11434/v1
 api_key: YOUR_API_KEY_HERE
 text_generation:
   model_id: gemma2:2b
-  prompt: You are a brief, but helpful bot.
+  prompt: "You are a brief, but helpful bot called {{ baibot_name }} powered by the {{ baibot_model_id }} model. The date/time now is: {{ baibot_now_utc }}."
   temperature: 1.0
   max_response_tokens: 4096
   max_context_tokens: 128000

docs/sample-provider-configs/openai-compatible.yml

@@ -2,7 +2,7 @@ base_url: ''
 api_key: YOUR_API_KEY_HERE
 text_generation:
   model_id: some-model
-  prompt: You are a brief, but helpful bot.
+  prompt: "You are a brief, but helpful bot called {{ baibot_name }} powered by the {{ baibot_model_id }} model. The date/time now is: {{ baibot_now_utc }}."
   temperature: 1.0
   max_response_tokens: 4096
   max_context_tokens: 128000

docs/sample-provider-configs/openai.yml

@@ -2,7 +2,7 @@ base_url: https://api.openai.com/v1
 api_key: YOUR_API_KEY_HERE
 text_generation:
   model_id: gpt-4o-2024-08-06
-  prompt: You are a brief, but helpful bot.
+  prompt: "You are a brief, but helpful bot called {{ baibot_name }} powered by the {{ baibot_model_id }} model. The date/time now is: {{ baibot_now_utc }}."
   temperature: 1.0
   max_response_tokens: 16384
   max_context_tokens: 128000

docs/sample-provider-configs/openrouter.yml

@@ -2,7 +2,7 @@ base_url: https://openrouter.ai/api/v1
 api_key: YOUR_API_KEY_HERE
 text_generation:
   model_id: mattshumer/reflection-70b:free
-  prompt: You are a brief, but helpful bot.
+  prompt: "You are a brief, but helpful bot called {{ baibot_name }} powered by the {{ baibot_model_id }} model. The date/time now is: {{ baibot_now_utc }}."
   temperature: 1.0
   max_response_tokens: 2048
   max_context_tokens: 8192

docs/sample-provider-configs/together-ai.yml

@@ -2,7 +2,7 @@ base_url: https://api.together.xyz/v1
 api_key: YOUR_API_KEY_HERE
 text_generation:
   model_id: meta-llama/Meta-Llama-3.1-405B-Instruct-Turbo
-  prompt: You are a brief, but helpful bot.
+  prompt: "You are a brief, but helpful bot called {{ baibot_name }} powered by the {{ baibot_model_id }} model. The date/time now is: {{ baibot_now_utc }}."
   temperature: 1.0
   max_response_tokens: 2048
   max_context_tokens: 8192