feat: add Resources and Prompts primitive examples

[heznpc]

Summary

Brings MCP primitive coverage up to parity with the TS sibling (mcp-server-starter). The starter now demonstrates all three MCP primitives out of the box:

• Tool — existing greet (unchanged)
• Resource — new server-info at info://server/status
• Prompt — new code-review with pydantic-validated args

Changes

Resources (src/my_mcp_server/resources/server_info.py)

• FastMCP API: @mcp.resource(uri, *, name, title, description, mime_type) decorator, handler returns str (JSON) — FastMCP takes care of wrapping into the MCP contents envelope.
• Reads package name + version from pyproject.toml via tomllib (walks up from the source file), with an importlib.metadata fallback for wheel installs where the source tree isn't shipped.
• Runtime block includes Python version (sys.version), platform (platform.system()), and arch (platform.machine()).

Prompts (src/my_mcp_server/prompts/code_review.py)

• FastMCP API: @mcp.prompt(name, title, description) wrapping a function whose signature defines the argsSchema; return type is list[UserMessage].
• Args validated by pydantic @validate_call: language: Literal["py","js","ts","go"] and code: Annotated[str, Field(min_length=1)]. Empty code and unsupported languages raise ValidationError before the handler body runs.
• Returns a single user message with a language-labeled fenced code block (e.g. ```py).

Tests (14 total, all green locally)

• tests/test_server_info.py — identity metadata, JSON shape, version matches pyproject.toml, Python runtime matches sys.version, resource is registered on the server.
• tests/test_code_review.py — identity metadata, rejects empty code / unsupported language / missing fields, happy-path message shape, per-enum language label interpolation, prompt is registered on the server.

Test audit (Task D)

• Mutation-checked test_greet by changing the handler's return to "Greetings, ". Both existing test_tools.py tests failed as expected — these are real behavioral assertions, not tautologies or file-existence checks. Reverted.
• No bogus tests found. pyproject.toml already has testpaths = ["tests"] with asyncio_mode = "auto" and does not use --passWithNoTests-style masking.

README

• English + Korean READMEs gain Adding Resources / Adding Prompts sections (English) and the Korean equivalents, plus Resources/Prompts bullets under "What You Get". The project tree diagram in README.md now shows resources/ and prompts/ modules and the two new test files.

FastMCP API shape used

# Resource
mcp.resource(
    "info://server/status",
    name="server-info",
    title="Server Info",
    description="...",
    mime_type="application/json",
)(async_handler_returning_str)

# Prompt
mcp.prompt(
    name="code-review",
    title="Code Review",
    description="...",
)(validate_call_decorated_handler_returning_list_UserMessage)

Test plan

• pytest -v — 14 passed
• ruff check . — all checks passed
• ruff format --check . — formatted
• mypy src/ — no issues (9 source files)
• End-to-end smoke: mcp.list_tools() / list_resources() / list_prompts() / read_resource() / get_prompt() all return the expected shapes
• CI green on 3.11 / 3.12 / 3.13