Implements complete flowchart generation for all four clauses of a Python try statement. Previously, try statements were not supported; this PR adds a new Try AST node that builds the full exception-handling subgraph:

• try body → an operation node feeding into an "exception raised?" decision diamond
• except <Type> → a yes-branch for each handler, chained in order (matched / not matched)
• else → taken on the no-exception path (after all handlers decline)
• finally → all paths (handled exception, unhandled exception, no exception) converge here before continuing

When the try body contains multiple statements they are folded into a single OperationNode (using the same astunparse.unparse pattern already used throughout the codebase) so the entire block is correctly scoped under the exception diamond.

try:
    a = setup()
    b = process(a)
    c = finalize(b)
except ValueError:
    handle()
else:
    success()
finally:
    cleanup()

Changes

• pyflowchart/ast_node.py — new Try AST node class that builds the full exception-handling subgraph (body → exc_cond diamond → handler chain → else → finally); multi-statement bodies are folded into a single OperationNode
• pyflowchart/node.py — register Try in the node dispatcher
• test/test.py — comprehensive test suite:
  • test_try_simple — basic try/except
  • test_try_multiline_body — multi-statement body folded into one node
  • test_try_full — all four clauses with two except handlers (except ValueError, except Exception as e), an else, and a finally
  • test_try_in_sequence — prepare() → try block → use(result) (try node connects correctly in a sequence)
  • test_try_in_loop — try/except nested inside a for loop (back-edges verified)
• README.md / README_zh-CN.md — document the new try/except/else/finally support with examples and a note that multiple statements in the try body are folded
• setup.py / pyproject.toml — bump version to 0.6.0b1

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