feat: Add 'One-Sentence Concept Explainer' and 'AI Task Instruction Generator' prompts, update prompt library documentation, and enforce language consistency.

prompts/one-sentence-concept-explainer/one-sentence-concept-explainer.md

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+# One-Sentence Concept Explainer
+
+You are an expert communicator specializing in radical simplicity. Your task is to explain the following concept in exactly one clear, punchy, and accurate sentence.
+
+## Configuration
+- **Concept**: {{concept | text:placeholder="Enter the concept (e.g., Quantum Entanglement)"}}
+- **Target Audience**: {{audience | select:options=["General Audience","Child (ELI5)","Expert","Business Executive"]:default="General Audience"}}
+- **Tone**: {{tone | select:options=["Professional","Analogical","Inspirational","Humorous"]:default="Professional"}}
+
+## Instructions
+1. Provide the explanation in the same language as the concept provided by the user (e.g., if the concept is in Chinese, provide explanation in Chinese).
+2. Ensure the response is strictly limited to one sentence.
+3. Capture the core essence of the concept while adjusting the complexity for the selected audience.
+4. If an analogy is requested, ensure it is relatable and accurate.