Replace hardcoded Windows paths with portable relative paths

[Copilot]

Two Python scripts contained hardcoded Windows drive paths (x:\FPGA\Project\embedfire_FPGA_ks), breaking portability across systems and directory structures.

Changes

• read_docs.py: Use os.path.dirname(os.path.abspath(__file__)) instead of hardcoded x:\FPGA\Project\...
• find_pins.py: Use script-relative path resolution instead of absolute Windows path

Both scripts now dynamically resolve file paths relative to their own location:

# Before
base_path = r"x:\FPGA\Project\embedfire_FPGA_ks"
pdf_file = os.path.join(base_path, "[野火]征途Pro_开发板规格书.pdf")

# After
base_path = os.path.dirname(os.path.abspath(__file__))
pdf_file = os.path.join(base_path, "[野火]征途Pro_开发板规格书.pdf")

Scripts now work from any clone location on any OS.

Original prompt

C盘

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