Add multi-station support, GWR fares API, and Circle line improvements

- Support any station with direct trains to Paddington; station CRS code
  is now part of the URL (/results/<crs>/<slug>/<date>)
- Load station list from data/direct_to_paddington.tsv; show dropdown on
  index page; 404 for unknown station codes
- Fetch live GWR walk-on fares via api.gwr.com for all stations (SSS/SVS/SDS
  with restrictions already applied per train); cache 30 days
- Scrape Paddington arrival platform numbers from RTT
- Show unreachable morning Eurostars (before first reachable service only)
- Circle line: show actual KX St Pancras arrival times (not check-in estimate)
  and add a second backup service in the transfer column
- Widen page max-width to 1100px for longer station names

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

data/direct_to_paddington.tsv

@@ -0,0 +1,129 @@
+Shenfield	SNF
+Brentwood	BRE
+Harold Wood	HRO
+Gidea Park	GDP
+Romford	RMF
+Chadwell Heath	CTH
+Goodmayes	GMY
+Seven Kings	SVK
+Ilford	IFD
+Manor Park	MNP
+Forest Gate	FOG
+Maryland	MYL
+Stratford (London)	SRA
+Whitechapel	ZLW
+London Liverpool Street	LST
+Farringdon	ZFD
+Tottenham Court Road	TCR
+Bond Street	BDS
+London Paddington	PAD
+Heathrow Airport Terminal 5	HWV
+Heathrow Central	HXX
+Hayes & Harlington	HAY
+Southall	STL
+Hanwell	HAN
+West Ealing	WEA
+Ealing Broadway	EAL
+Acton Main Line	AML
+Abbey Wood	ABW
+Woolwich	WWC
+Custom House	CUS
+Canary Wharf	CWX
+Reading	RDG
+Twyford	TWY
+Maidenhead	MAI
+Taplow	TAP
+Burnham	BNM
+Slough	SLO
+Langley	LNY
+Iver	IVR
+West Drayton	WDT
+Oxford	OXF
+Didcot Parkway	DID
+Heathrow Airport Terminal 4	HAF
+Cholsey	CHO
+Goring & Streatley	GOR
+Pangbourne	PAN
+Tilehurst	TLH
+Bristol Temple Meads	BRI
+Bath Spa	BTH
+Chippenham	CPM
+Swindon	SWI
+Hereford	HFD
+Ledbury	LED
+Colwall	CWL
+Great Malvern	GMV
+Malvern Link	MVL
+Worcester Foregate Street	WOF
+Worcester Shrub Hill	WOS
+Worcestershire Parkway	WOP
+Pershore	PSH
+Evesham	EVE
+Honeybourne	HYB
+Moreton-in-Marsh	MIM
+Kingham	KGM
+Charlbury	CBY
+Hanborough	HND
+Penzance	PNZ
+St Erth	SER
+Camborne	CBN
+Redruth	RED
+Truro	TRU
+St Austell	SAU
+Par	PAR
+Bodmin Parkway	BOD
+Liskeard	LSK
+Plymouth	PLY
+Totnes	TOT
+Newton Abbot	NTA
+Exeter St Davids	EXD
+Taunton	TAU
+Bedwyn	BDW
+Hungerford	HGD
+Kintbury	KIT
+Newbury	NBY
+Thatcham	THA
+Theale	THE
+Reading West	RDW
+Swansea	SWA
+Neath	NTH
+Port Talbot Parkway	PTA
+Bridgend	BGN
+Cardiff Central	CDF
+Newport (South Wales)	NWP
+Bristol Parkway	BPW
+Newbury Racecourse	NRC
+Midgham	MDG
+Aldermaston	AMT
+Cheltenham Spa	CNM
+Gloucester	GCR
+Stonehouse	SHU
+Stroud	STD
+Kemble	KEM
+Frome	FRO
+Westbury	WSB
+Pewsey	PEW
+Weston-super-Mare	WSM
+Weston Milton	WNM
+Worle	WOR
+Yatton	YAT
+Nailsea & Backwell	NLS
+Tiverton Parkway	TVP
+Castle Cary	CLC
+Bridgwater	BWT
+Highbridge & Burnham	HIG
+Carmarthen	CMN
+Ferryside	FYS
+Kidwelly	KWL
+Pembrey & Burry Port	PBY
+Llanelli	LLE
+Paignton	PGN
+Torquay	TQY
+Torre	TRR
+Teignmouth	TGM
+Dawlish	DWL
+Banbury	BAN
+Greenford	GFD
+South Greenford	SGN
+Castle Bar Park	CBP
+Drayton Green	DRG