Add procedures table with CIFP transition sequences

[apps4av]

Summary

• Adds a new procedures table built from the FAA CIFP (FAACIFP18, ARINC 424-18). It expands SID/STAR/approach records into flyable transition sequences, so an approach with several IAFs becomes one sequence per starting point.
• New root-level procedures.py (stdlib only) produces procedures.csv with columns: airport, procedure, initial_fix, sequence, fix, altitude.
• Procedure names come from the d-TPP metafile: SIDs/STARs link via faanfd18; approaches are named by decoding/matching the CIFP identifier to the chart name (~100% match on the current cycle). Falls back to a synthesized name when the metafile is unavailable.

Details

• common.make_data() now calls procedures.parse_procedures() right after cifp.parse_cifp(), so the CSV is regenerated for both the legacy and x database builds.
• data.py does a best-effort download of the d-TPP metafile for the current cycle; wrapped in try/except so a not-yet-published metafile can't break the build.
• legacy/importother.sql and x/importother.sql create and import the procedures table (same pattern as cifp_sid_star_app).
• Field values are comma-stripped before writing, since the pipeline's .separator "," / .import does not handle quoted fields.

Output example (KBVY RNAV (GPS) RWY 09)

KBVY,RNAV (GPS) RWY 09,COLLE,1,COLLE,2000
KBVY,RNAV (GPS) RWY 09,COLLE,2,EXXRO,2000
KBVY,RNAV (GPS) RWY 09,COLLE,3,DIXNN,1800
KBVY,RNAV (GPS) RWY 09,COLLE,4,ZAPOB,700
KBVY,RNAV (GPS) RWY 09,COLLE,5,MEMAE,297
KBVY,RNAV (GPS) RWY 09,RIKAH,1,RIKAH,3000
...

Test plan

• Ran procedures.py on the live cycle: 166,576 rows generated.
• Imported procedures.csv into SQLite via the exact pipeline mechanism (.separator "," + .import): 166,576 rows, 0 column-alignment errors.
• Verified KBVY RNAV (GPS) RWY 09 sequences match the expected output.
• Verified graceful fallback to synthesized names when the metafile is absent.
• py_compile passes for procedures.py, common.py, data.py.

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